BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Handling Atomic Quantum States DTSTART;VALUE=DATE-TIME:20220831T100000Z DTEND;VALUE=DATE-TIME:20220831T110000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-615@cern.ch DESCRIPTION:Speakers: Francesco Cataliotti (CNR - INO)\nHandling Atomic Qu antum States\n\nhttps://indico.unina.it/event/58/contributions/615/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/615/ END:VEVENT BEGIN:VEVENT SUMMARY:Probing Atomic Quantum States DTSTART;VALUE=DATE-TIME:20220829T123000Z DTEND;VALUE=DATE-TIME:20220829T133000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-614@cern.ch DESCRIPTION:Speakers: Francesco Cataliotti (CNR - INO)\nProbing Atomic Qua ntum States\n\nhttps://indico.unina.it/event/58/contributions/614/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/614/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum transport in open spin chains - part 2 - Prof. Laleh Memar zadeh DTSTART;VALUE=DATE-TIME:20220830T140000Z DTEND;VALUE=DATE-TIME:20220830T153000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-613@cern.ch DESCRIPTION:https://indico.unina.it/event/58/contributions/613/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/613/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum transport in open spin chains DTSTART;VALUE=DATE-TIME:20220830T070000Z DTEND;VALUE=DATE-TIME:20220830T083000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-611@cern.ch DESCRIPTION:Speakers: Laleh Memarzadeh (Sharif University of Technology)\n After reviewing the general mathematical framework for describing dynamics of open quantum systems\, we focus on quantum Markovian processes. We rec all two main approaches for deriving Markovian master equation within the weak-coupling limit\, namely "local" and "global" approaches. \n\nAfter hi ghlighting the results of investigations for comparing the virtues and wea knesses of each approach\, we focus on transport properties of a spin chai n when either approach is used to describe the dynamics. More specifically we use these two approaches for describing the dynamics of a spin chain w ith XX Hamiltonian in an external field when the two ends of the spin chai n are coupled to two thermal baths at different temperatures. This enables us to compare the predictions of each approach for transport properties o f the open spin chain. In the global approach non-local effects of local b aths are observed in the spin continuity equation as sink/source terms. Th ese non-local features are missed in the local approach. Furthermore\, we see that the asymptotic transport properties of the chain in the local app roach can not be derived from the asymptotic properties of the global appr oach when interaction between spins in the chain tends to zero. We finish the discussion by discussing how varying Hamiltonian parameters leads to h aving negative transition frequencies and as a result the asymptotic spin and heat flows exhibit discontinuities.\n\nhttps://indico.unina.it/event/5 8/contributions/611/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/611/ END:VEVENT BEGIN:VEVENT SUMMARY:Frequency metrology and laser stabilization: tools for Quantum tec hnologies DTSTART;VALUE=DATE-TIME:20220829T133000Z DTEND;VALUE=DATE-TIME:20220829T150000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-612@cern.ch DESCRIPTION:Speakers: Mario Siciliani de Cumis (Agenzia Spaziale Italiana) \nNowadays\, Time and Frequency Metrology are key elements in optics\, spe ctroscopy\, geodesy and Quantum Technologies. In particular\, coherent fib er links (up to 1800 km) have been demonstrated powerful for frequency d issemination on ultra low noise scales. Laser stabilization is therefore c rucial for frequency metrology and for high accuracy measurements. Here\, we will present how these tools can be crucial in quantum technologies. A couple of examples regarding quantum communication and quantum sensing wi ll be shown.\n\nhttps://indico.unina.it/event/58/contributions/612/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/612/ END:VEVENT BEGIN:VEVENT SUMMARY:Superfluids of atoms and of light as analog models of gravity: a f ruitful synergy of gravity and quantum optics - part 2- Dr. Iacopo Carusot to DTSTART;VALUE=DATE-TIME:20220903T090000Z DTEND;VALUE=DATE-TIME:20220903T103000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-610@cern.ch DESCRIPTION:https://indico.unina.it/event/58/contributions/610/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/610/ END:VEVENT BEGIN:VEVENT SUMMARY:Introduction to quantum control methods for Quantum Technologies- part 2 - Dr. Luigi Giannelli DTSTART;VALUE=DATE-TIME:20220903T070000Z DTEND;VALUE=DATE-TIME:20220903T083000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-609@cern.ch DESCRIPTION:https://indico.unina.it/event/58/contributions/609/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/609/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum thermodynamics in circuits - part 2 - Dr. Bayan Karimi DTSTART;VALUE=DATE-TIME:20220901T070000Z DTEND;VALUE=DATE-TIME:20220901T083000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-608@cern.ch DESCRIPTION:https://indico.unina.it/event/58/contributions/608/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/608/ END:VEVENT BEGIN:VEVENT SUMMARY:Entanglement for Quantum Technologies - part 2 - Prof. Augusto Sme rzi DTSTART;VALUE=DATE-TIME:20220831T090000Z DTEND;VALUE=DATE-TIME:20220831T100000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-606@cern.ch DESCRIPTION:https://indico.unina.it/event/58/contributions/606/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/606/ END:VEVENT BEGIN:VEVENT SUMMARY:A new programmable quantum simulator with two-electron Rydberg ato ms in optical tweezer arrays DTSTART;VALUE=DATE-TIME:20220829T162000Z DTEND;VALUE=DATE-TIME:20220829T163500Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-573@cern.ch DESCRIPTION:Speakers: Luca Guariento (University of Naples Federico II\, C NR-INO)\nI will present a new programmable quantum simulator based on Rydb erg strontium atoms trapped in optical tweezers arrays at CNR-INO and Depa rtment of Physics in Florence. This new experimental setup\, supported by an infrastructural program of CNR\, is now under construction in our labor atories as a joint effort of CNR and the University of Florence. I will pr esent the main features of the apparatus\, including the techniques that w ill be employed for the generation of programmable arrays of optical tweez ers and for the control of the different sources of decoherence. I will al so discuss the advantages offered by two-electron atoms\, including narrow optical transitions that can be exploited for effective atomic cooling sc hemes\, and the existence of a metastable state that provides an additiona l degree of freedom for the manipulation of individual atoms\, as well as a direct connection to frequency metrology. I will finally discuss the app lications that we envision for this new setup\, in particular the simulati on of quantum spin models with different types of interactions and topolog ies\, and the realization of multi-particle entangled states.\n\nhttps://i ndico.unina.it/event/58/contributions/573/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/573/ END:VEVENT BEGIN:VEVENT SUMMARY:Entanglement for quantum technologies DTSTART;VALUE=DATE-TIME:20220830T090000Z DTEND;VALUE=DATE-TIME:20220830T103000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-577@cern.ch DESCRIPTION:Speakers: Augusto Smerzi (INO-CNR)\nI will first briefly intro duce the concept of quantum entanglement\, highlighting its differences wi th classical correlations. I’ll therefore discuss the concept of Bell no n-locality\, which plays a central role in quantum cryptography and device independent certification\, using a diagrammatic causal inference analysi s. This approach will allow us to investigate the physical meaning of the free-will\, realism\, and locality assumptions used to derive the Bell ine qualities. I’ll conclude the course by introducing the concept of metrol ogical entanglement\, namely the class of entangled states that can provid e sub shot-noise sensitivities in generic phase estimation problems. I’l l demonstrate that this class of states is witnessed by the Fisher informa tion.\n\nhttps://indico.unina.it/event/58/contributions/577/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/577/ END:VEVENT BEGIN:VEVENT SUMMARY:Gate Model Quantum Computing and Waveguide QED with Superconducti ng Qubits DTSTART;VALUE=DATE-TIME:20220902T140000Z DTEND;VALUE=DATE-TIME:20220902T153000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-598@cern.ch DESCRIPTION:Speakers: William D. Oliver (MIT Lincoln Laboratory)\nQuantum computers are fundamentally different from conventional computers. They pr omise to address problems that are practically prohibitive and even imposs ible to solve using today’s supercomputers. The challenge is building on e that is large enough to be useful. In this talk\, we will study two topi cs: 1) we will consider gate-model quantum computation and the engineering of high-performance superconducting qubits\, and 2) we will consider expe rimental waveguide QED and its application to extensible systems.\n\nhttps ://indico.unina.it/event/58/contributions/598/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/598/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum control of a harmonic oscillator using a superconducting q ubit DTSTART;VALUE=DATE-TIME:20220902T090000Z DTEND;VALUE=DATE-TIME:20220902T103000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-579@cern.ch DESCRIPTION:Speakers: Simone Gasparinetti (Chalmers University of Technolo gy)\nIn quantum information processing\, a bit of information is customari ly represented using a pair of energy levels acting as a quantum two-level system. As an alternative strategy\, one can encode the quantum bits in n onclassical states of harmonic oscillators ("bosonic modes")\, while still relying on nonlinear elements for state manipulation and readout. This la tter approach presents advantages such as longer coherence times\, resourc e-efficient quantum error correction\, and well-understood loss channels. In particular\, hosting non-classical states of light in three-dimensional microwave cavities has emerged as a promising paradigm for continuous-var iable quantum computation. In this paradigm\, superconducting qubits play the role of "quantum controllers" of the states in these cavities. In this second lecture I will outline this approach and review recent advances\, including our own work.\n\nhttps://indico.unina.it/event/58/contributions/ 579/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/579/ END:VEVENT BEGIN:VEVENT SUMMARY:Superfluids of atoms and of light as analog models of gravity: a f ruitful synergy of gravity and quantum optics DTSTART;VALUE=DATE-TIME:20220902T070000Z DTEND;VALUE=DATE-TIME:20220902T083000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-593@cern.ch DESCRIPTION:Speakers: Iacopo Carusotto (INO-CNR BEC Center)\nIn these lect ures\, I will present the state of the art and the new perspectives in the theoretical and experimental study of analog models of quantum field theo ries in flat\, curved\, or time-dependent backgrounds using condensed matt er and optical systems.\n\nAfter a brief presentation of the general conce pt of analog model\, I will review milestone theoretical and experimental works on Hawking emission of phonons from acoustic horizons in trans-sonic flows of ultracold atoms. In particular\, I will highlight the crucial ro le of density correlations in providing an unambiguous signature of Hawkin g emission - the so-called Balbinot-Fabbri moustache.\n\nAfter introducing the general concept of quantum fluid of light and reviewing milestone exp eriments in Bose-Einstein condensation and superfluidity\, I will sketch t he on-going efforts towards the observation of Hawking emission in these o ptical systems and the advantages/disadvantages introduced by their intrin sically non-equilibrium condition. In particular\, I will outline an unexp ected interplay between Hawking emission and the quasi-normal modes of the black hole and I will discuss its possible consequences on the zero-point fluctuations of the gravitational field around astrophysical black holes. \n\nI will then move to superradiant effects in different geometries. Base d on the textbook theory of parametric amplification and oscillation in op tics\, I will first introduce the general concepts of superradiant scatter ing\, superradiant quantum emission and superradiant instabilities in quan tum field theories\, then I will move to specific geometries: in rotating configurations\, the concept of ergoregion instability provides an intuiti ve understanding of the well-known instability of multiply charged vortice s\; introduction of synthetic gauge fields in planar geometries extends th e range of space-time metrics that can be generated and allows for analyti cal insight into superradiant phenomena using quantum optics concepts. Thi s shines new light on the subtle relations between superradiant scattering \, quantum superradiant emission and superradiant instabilities and sugges ts how quantum optical phenomena might play a role in astrophysical proces ses.\n\nFinally\, I will outline the on-going investigations in the direct ion of observing back-reaction effects of the quantum field onto the backg round: the crucial impact of quantum fluctuations of the quantum friction force is first highlighted in single-mode configurations amenable to circu it-QED realizations for which microscopic theoretical insight is available . I will then switch to cosmological models that may be investigated on co ld atom platforms\, in particular to investigate the preheating stage of t he early Universe at the end of inflation: here\, quantum-fluctuation-indu ced mechanisms for the decay of the inflaton field are identified\, as wel l as unexpected channels for decoherence under the effect of quantum fluct uations of the parametric particle creation effect. I will conclude by ske tching the outstanding problem of the back-reaction of Hawking emission on to a black hole and its relation to celebrated information paradoxes in gr avity.\n\nhttps://indico.unina.it/event/58/contributions/593/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/593/ END:VEVENT BEGIN:VEVENT SUMMARY:The half-integer flux quantum effect DTSTART;VALUE=DATE-TIME:20220901T170000Z DTEND;VALUE=DATE-TIME:20220901T180000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-590@cern.ch DESCRIPTION:Speakers: John R. Kirtley (Stanford University)\nThis talk is a personal history of the half-integer flux quantum effect\, and its role in the demonstration of d-wave pairing symmetry in the cuprate high-temper ature superconductors.\n\nhttps://indico.unina.it/event/58/contributions/5 90/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/590/ END:VEVENT BEGIN:VEVENT SUMMARY:The SQUID: Fundamentals and Applications DTSTART;VALUE=DATE-TIME:20220901T160000Z DTEND;VALUE=DATE-TIME:20220901T170000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-580@cern.ch DESCRIPTION:Speakers: John Clarke (University of California\, Berkeley)\nS uperconducting electronics was born in a remarkably short\, three-year per iod that began one-half century after the discovery of superconductivity. The crucial steps were the observation of flux quantization in 1961\, the prediction and observation of Josephson tunneling in 1962 and 1963\, respe ctively\, and the demonstration of quantum interference in a superconducti ng ring containing two Josephson junctions in 1964—the Superconducting Q Uantum Interference Device. I briefly review my early work as a research s tudent at the University of Cambridge. Today’s SQUIDs\, fabricated from patterned\, multilayer thin films on silicon wafers\, offer extraordinary sensitivity to magnetic flux and have a broad range of applications. I des cribe experiments to image distent galaxy clusters\, to search for the axi on—a candidate particle for cold dark matter— and to perform magnetic resonance imaging (MRI) in microtesla magnetic fields.\n\nhttps://indico.u nina.it/event/58/contributions/580/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/580/ END:VEVENT BEGIN:VEVENT SUMMARY:Introduction to quantum control methods for Quantum Technologies DTSTART;VALUE=DATE-TIME:20220901T140000Z DTEND;VALUE=DATE-TIME:20220901T153000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-574@cern.ch DESCRIPTION:Speakers: Luigi Giannelli (CNR-IMM\, Catania)\nThe ability to accurately control a quantum system (Quantum Control) is a fundamental req uirement in the development of quantum technologies\, with applications ra nging from quantum information processing to high-precision measurements. Very often quantum control aims at reaching a given target state\, impleme nting a quantum gate\, or the cooling of atomic ensembles and nanomechanic al oscillators.\nIn these lectures I will introduce some well established methods as well as some recently developed methods that are used to perfor m Quantum Control. In particular I will explain: 1) Transitionless Quantum Driving (or Shortcut to Adiabaticity)\, 2) Quantum Optimal Control\, and 3) Reinforcement Learning. As an example\, I will show the application of these methods to the problem of population transfer in a three-level $\\L ambda$ system.\n\nhttps://indico.unina.it/event/58/contributions/574/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/574/ END:VEVENT BEGIN:VEVENT SUMMARY:Circuit QED: from microwave quantum optics to quantum computation DTSTART;VALUE=DATE-TIME:20220901T090000Z DTEND;VALUE=DATE-TIME:20220901T103000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-578@cern.ch DESCRIPTION:Speakers: Gasparinetti Simone (Chalmers University of Technolo gy)\nIn the last twenty years\, circuit quantum electrodynamics (QED) has emerged as a leading architecture for quantum computation. Circuit QED is based on superconducting circuits resonating at microwave frequencies. Its enabling element is the Josephson junction\, which endows these modes wit h a tunable nonlinearity without adding losses. This way one can define mo des with tailored energy spectra ("artificial matter") and have them inter act with microwave resonators and waveguides ("light"). The possibility to engineer these interactions with an unprecedented degree of control and t unability is key to circuit QED's success. In this first lecture I will gi ve a general introduction to the field and to some of its applications\, a lso beyond quantum computation.\n\nhttps://indico.unina.it/event/58/contri butions/578/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/578/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum thermodynamics in circuits DTSTART;VALUE=DATE-TIME:20220831T070000Z DTEND;VALUE=DATE-TIME:20220831T083000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-592@cern.ch DESCRIPTION:Speakers: Bayan Karimi (University of Helsinki)\nIn the two l ectures\, we investigate both experimentally and theoretically phenomena a nd devices in quantum thermodynamics realized by superconducting and metal circuits on a chip at low millikelvin temperatures\, which is a novel are a of research that we call circuit quantum thermodynamics\, cQTD.\n\nWe st art by briefly introducing the building blocks in the experiments such as harmonic oscillators (superconducting cavities)\, non-linear oscillators ( Josephson junctions)\, and heat baths formed of resistors and phonons on t he chip substrate\, thermometers and local coolers. Then we build useful d evices out of them including heat valves\, rectifiers\, refrigerators\, an d detectors with ultimate resolution and try to give a full thermal descri ption of them.\n\nhttps://indico.unina.it/event/58/contributions/592/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/592/ END:VEVENT BEGIN:VEVENT SUMMARY:Molecular Photons based Quantum Key Distribution at Room Temperatu re DTSTART;VALUE=DATE-TIME:20220902T163500Z DTEND;VALUE=DATE-TIME:20220902T165500Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-596@cern.ch DESCRIPTION:Speakers: Ghulam Murtaza (UNINA & National Optical Institute ( CNR-INO))\nQuantum key distribution (QKD) renders long-term solution for i nformation-theoretic secure communication by exploiting basic laws of quan tum physics. However\, hardware imperfections limit unconditional security in QKD\, for instance the presence of pulses containing multiple photons in BB84 protocol. Weak coherent pulses\, defects in diamonds and quantum d ots bases QKD is already under discussion but molecule-based single photon source for QKD haven’t been reported to date. We present single molecul es of polyaromatic hydrocarbons integrated in suitable hosts emitting narr ow-band and indistinguishable single-photons at 785nm with high quantum ef ficiency. Proof-of-concept BB84 protocol employing single photons on deman ds at room temperature achieves secret key rate of 0.5 Mbps. Our molecular single photon source with high purity and scalable system operating at ro om temperature paves the way for future quantum cryptography.\n\nhttps://i ndico.unina.it/event/58/contributions/596/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/596/ END:VEVENT BEGIN:VEVENT SUMMARY:Dissipative stabilization of entangled qubit pairs in quantum arra ys DTSTART;VALUE=DATE-TIME:20220902T174000Z DTEND;VALUE=DATE-TIME:20220902T175500Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-595@cern.ch DESCRIPTION:Speakers: JACOPO ANGELETTI (Università di Camerino)\nWe study the dissipative stabilisation of entangled states in arrays of quantum sy stems. Specifically\, we are interested in the states of qubits (spins-1/2 ) which may or may not interact with one or more cavities (bosonic modes). In all cases only one element\, either a cavity or a qubit\, is lossy and irreversibly coupled to a reservoir. When the lossy element is a cavity\, we consider a squeezed reservoir and only interactions which conserve the number of cavity excitations. Instead\, when the lossy element is a qubit \, we consider pure decay and a properly selected structure of XX- and XY- interactions. We show that in all cases\, in the steady state\, many pairs of distant\, non-directly interacting qubits\, which cover the whole arra y\, can get entangled.\n\nhttps://indico.unina.it/event/58/contributions/5 95/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/595/ END:VEVENT BEGIN:VEVENT SUMMARY:On the Implementation of Fuzzy Inference Engines on Quantum Comput ers DTSTART;VALUE=DATE-TIME:20220902T171000Z DTEND;VALUE=DATE-TIME:20220902T172500Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-583@cern.ch DESCRIPTION:Speakers: Roberto Schiattarella (Department of Physics 'Ettore Pancini'\, University of Naples Federico II)\nQuantum computers can be a revolutionary tool to implement inference engines for fuzzy rule-based sys tems. In fact\, the use of quantum mechanical principles can enable parall el execution of fuzzy rules and allow them to be used efficiently in compl ex contexts such as distributed and big data environments. Our research in troduces the very first quantum-based fuzzy inference engine that is capab le of providing exponential acceleration in fuzzy rule execution compared to its classical counterpart\, and allows a quantum computer to be program med by fuzzy linguistic rules. The proposed inference engine was implement ed using a quantum algorithm design scheme based on the oracle notion. Thi s scheme allows the modeling of a fuzzy rule-based system as a Boolean fun ction\, the oracle\, which is able to reconstruct the relationships betwee n the antecedent and consequent parts of fuzzy rules\, and can be efficien tly computed on a quantum computer. The suitability of the proposed quantu m algorithm for use as a fuzzy inference engine was tested in typical benc hmark scenarios\, such as that provided by inverted pendulum control.\n\nh ttps://indico.unina.it/event/58/contributions/583/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/583/ END:VEVENT BEGIN:VEVENT SUMMARY:(Causal)-Activation of Complex Entanglement Structures in Quantum Networks DTSTART;VALUE=DATE-TIME:20220902T165500Z DTEND;VALUE=DATE-TIME:20220902T171000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-572@cern.ch DESCRIPTION:Speakers: Seid Koudia ()\nEntanglement represents ``the'' key resource for several applications of quantum information processing\, rang ing from quantum communications to distributed quantum computing. Despite its fundamental importance\, deterministic generation of maximally entangl ed qubits represents an on-going open problem. Here\, we design a novel ge neration scheme exhibiting two attractive features\, namely\, i) determini stically generating different classes -- namely\, GHZ-like\, W-like and gr aph states -- of genuinely multipartite entangled states\, ii) without req uiring any direct interaction between the qubits. Indeed\, the only necess ary condition is the possibility of coherently controlling -- \naccording to the indefinite causal order framework -- the causal order among the uni taries acting on the qubits. Through the paper\, we analyze and derive the conditions on the unitaries for deterministic generation\, and we provide examples for unitaries practical implementation. We conclude the paper by discussing the scalability of the proposed scheme to higher dimensional G ME states and by introducing some possible applications of the proposal fo r quantum networks. In particular\, distributed entanglement generation of graph states in quantum networks based on indefinite causal ordering will be highlighted.\n\nhttps://indico.unina.it/event/58/contributions/572/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/572/ END:VEVENT BEGIN:VEVENT SUMMARY:Deep learning density functionals for gradient descent optimizatio n DTSTART;VALUE=DATE-TIME:20220902T172500Z DTEND;VALUE=DATE-TIME:20220902T174000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-587@cern.ch DESCRIPTION:Speakers: Emanuele Costa (University of Camerino)\nMachine-lea rned regression models represent a promising tool to implement accurate an d compu-\ntationally affordable energy-density functionals to solve quantu m many-body problems via density\nfunctional theory. However\, in continuo us systems\, while they can easily be trained to accurately map ground-sta te density\nprofiles to the corresponding energies\, their functional deri vatives often turn out to be too noisy\,\nleading to instabilities in self -consistent iterations and in gradient-based searches of the ground-state\ ndensity profile. We investigate how these instabilities occur when standa rd deep neural networks\nare adopted as regression models\, and we show ho w to avoid them using an ad-hoc convolutional archi-\ntecture featuring an inter-channel averaging layer. \nFurthermore we study how this methods ca n be extended to spin models relevant for quantum simulators\, considering a 1d quantum transverse\nIsing model with nearest-neighbours interaction. We study the conditions for applying DFT in quantum discrete systems and we implement a different kind of\narchitecture (U-NET) to map the magnetiz ation per site to the functional per site.\nnoninteracting atoms in optica l speckle disorder. With the inter-channel average\, accurate and sys-\nte matically improvable ground-state energies and density profiles are obtain ed via gradient-descent\noptimization\, without instabilities nor violatio ns of the variational principle.\n\nhttps://indico.unina.it/event/58/contr ibutions/587/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/587/ END:VEVENT BEGIN:VEVENT SUMMARY:Ferro-Transmon Qubit: prospective and feasibility DTSTART;VALUE=DATE-TIME:20220902T162000Z DTEND;VALUE=DATE-TIME:20220902T163500Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-588@cern.ch DESCRIPTION:Speakers: Raffaella Ferraiuolo (Università degli studi di Nap oli Federico II)\nThe technological and scientific advancements over the l ast decade in the Quantum Computing field have seen the outbreak of severa l qubit layouts whose goal has been to enhance their performances [1\,2]. In this context\, our work focuses on the development of a new Qu-bit prot otype that goes beyond conventional transmon architecture where a resonato r is capacitively coupled with a SQUID loop [2].\nOur proposal aims to eva luate a new concept of qubit design based on a Ferromagnetic Josephson jun ction (MJJ) employed in the transmon architecture that allows having a dev ice that we call Ferro-Transmon Qu-bit. Due to the presence of a ferromagn etic layer\, MJJs allow switching the state of the system with dependence on the applied magnetic field [3]. Moreover\, MMJs in an RF circuit\, have shown compelling perspectives such as the possibility to add a new degree of freedom to control their states by single RF magnetic pulses [4]. The feasibility to employ MMJs to build a Ferro-Transmon Qu-bit has been alrea dy proved by Ahmad et al. [5]. It will discuss the characterization of MJJ s based on niobium and aluminum technologies\, to investigate and compare their novel features to evaluate their suitable implementation in quantum circuits like that of transmon Qu-bit design [6]. Then will be analyzed th e needed steps for the realization of the proposed Ferro-Transmon device s uch as the development of a coplanar waveguide resonator and its capacitiv e coupling to the designed MJJs in SQUID configuration [7]. \n\nBibliograp hy\n\n[1] M. H. Devoret and R. J. Schoelkopf\, Science 339\, 1169 (2013).\ n\n[2] P. Krantz\, M. Kjaergaard\, F. Yan\, T. P. Orlando\, S. Gustavsson\ , and W. D. Oliver\, Appl. Phys. Rev. 2\, vol.6\, 021318 (2019).\n\n[3] R. Satariano\, L. Parlato\, A. Vettoliere\, R. Caruso\, H. G. Ahmad\, A. Mia no\, L. Di Palma\, D. Salvoni\, D. Montemurro\, C. Granata\, G. Lamura\, F . Tafuri\, G. P. Pepe\, D. Massarotti\, and G. Ausanio\, Phys. Rev. B 103\ , 224521 (2021).\n\n[4] R. Caruso\, D. Massarotti\, V. V. Bol’ginov\, A. Ben-Hamida\, N. Karelina\, A. Miano\, I. Vernik\, F. Tafuri\, V. Ryazanov \, O. Mukhanov\, and G. P. Pepe\, J. Appl. Phys. 123\, 133901 (2018).\n\n[ 5] H. G. Ahmad\, V. Brosco\, A. Miano\, L. Di Palma\, M. Arzeo\, D. Montem urro\, P. Lucignano\, G. P. Pepe\, F. Tafuri\, R. Fazio\, and D. Massarott i\, Phys. Rev. B 105\, 214522 (2022).\n\n[6] A. Vettoliere\, R. Satariano\ , R. Ferraiuolo\, L. Di Palma\, H. G. Ahmad\, G. Ausanio\, G. P. Pepe\, F. Tafuri\, D. Montemurro\, C. Granata\, L. Parlato and D. Massarotti\, Appl . Phys. Lett. 120\, 262601 (2022).\n\n[7] R. Ferraiuolo\, G. Serpico\, L. Parlato\, H. G. Ahmad\, D. Massarotti\, and D. Montemurro\, Accepted by IE EE transaction on applied superconductivity\, 15th Workshop on Low Tempera ture Electronics (IEEE WOLTE-15) (2022).\n\nhttps://indico.unina.it/event/ 58/contributions/588/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/588/ END:VEVENT BEGIN:VEVENT SUMMARY:Fabrication and characterization of magnetic Josephson Junction to wards quantum circuits DTSTART;VALUE=DATE-TIME:20220902T160000Z DTEND;VALUE=DATE-TIME:20220902T162000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-589@cern.ch DESCRIPTION:Speakers: Roberta Satariano (University of Naples Federico II) \nThe competition between superconducting and ferromagnetic orders in magn etic Josephson Junctions (JJs) has paved the way for advances in supercond ucting digital technology\, cryogenic memories\, and potentially for quant um computing\, where the possibility of switching between different critic al currents states by means of magnetic pulses is a crucial advantage. We have shown that our approach to use a strong ferromagnet Permalloy (Py) as F-barrier in tunnel SISFS (Superconductor/Insulator/superconductor/Ferrom agnet/Superconductor) JJs based on Nb technology allows to scale the junct ions’ dimensions down to a few μm2 and we have demonstrated their funct ionality as memory elements compatible in speed and power dissipation with standard single flux quantum (SFQ) circuitry. In principle\, these juncti ons are scalable down to sub-micrometer dimensions: in the framework of th e quantum computation\, a high-density cryogenic classical memory technolo gy is sought to provide supporting functions for qubit circuits such as re ad out\, control and error-correction. Moreover\, we have transferred our knowledge from the Nb-based to Al-based lithography process and demonstrat ed the hysteretic behavior of the magnetic field pattern in very low quasi -particle dissipation SISFS JJs with Al electrodes. Since superconducting quantum circuits rely almost exclusively on Al based JJs\, these results a re an important steps in promoting alternative control and readout schemes in superconducting qubits.\n\nhttps://indico.unina.it/event/58/contributi ons/589/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/589/ END:VEVENT BEGIN:VEVENT SUMMARY:Single Molecules in Integrated Optical Cavities and Waveguides DTSTART;VALUE=DATE-TIME:20220830T173500Z DTEND;VALUE=DATE-TIME:20220830T175000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-594@cern.ch DESCRIPTION:Speakers: Ramin Emadi (University of Naples Federico II)\nOn-c hip integration of deterministic single photon sources is of major signifi cance in different emerging areas of quantum technologies like computing\, sensing and so forth. In this talk\, we are going to discuss some approac hes towards integration of an organic-based single photon source\, namely dibenzo-terrylene/anthracene nano-crystals to inorganic photonic structure s to boost collection efficiency in addition to having multiple single pho ton sources on a single platform. Besides\, we will present our findings r egarding implementation of two photon interference experiment from two dis tinct single photon sources on a single chip which is of great importance for quantum computation.\n\nhttps://indico.unina.it/event/58/contributions /594/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/594/ END:VEVENT BEGIN:VEVENT SUMMARY:A new experimental apparatus for trapping ytterbium atoms in optic al tweezer arrays DTSTART;VALUE=DATE-TIME:20220830T172000Z DTEND;VALUE=DATE-TIME:20220830T173500Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-591@cern.ch DESCRIPTION:Speakers: Omar Abdel Karim (CNR-INO)\nUltracold neutral atoms trapped in optical lattices and optical tweezers have emerged as groundbre aking tools to realize new systems for quantum information processing\, pr ecision measurements and quantum simulation. Optical tweezer arrays provid e the ability to spatially manipulate ultracold atoms and control tunnelin g and interaction at the single-particle level\, allowing the study of man y-body physics phenomena in presence of impurities. The ytterbium atom rev eals as a perfect candidate for studying this kind of physics due to its r ich level structure providing very low temperature cooling and due to the presence of both bosonic and fermionic isotopes.\nMy PhD project inserts i n this context\, in an experiment started in 2021 from the collaboration o f the University of Trieste (UniTs) and CNR-INO unit of Basovizza (TS). He re\, we designed (and at the moment we are realizing) a novel experimental apparatus for trapping ultracold Yb atoms in optical tweezer micro-traps\ , comprehensive of lasers paths used for cooling\, trapping and manipulati ng atoms\, and the UHV vacuum system\, which is connected to the science c ell.\n\nhttps://indico.unina.it/event/58/contributions/591/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/591/ END:VEVENT BEGIN:VEVENT SUMMARY:Distributed Quantum Sensing for optical and atom interferometry DTSTART;VALUE=DATE-TIME:20220830T170500Z DTEND;VALUE=DATE-TIME:20220830T172000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-586@cern.ch DESCRIPTION:Speakers: Marco Malitesta (QSTAR\, INO-CNR and University of N aples "Federico II")\nWe propose an estimation scheme based on the distrib ution of a single squeezed state among d interferometers to achieve highly sensitive estimation of multiple parameters. The scheme admits different implementations ranging from optical to atom interferometry. The fundament al component of our scheme is the “quantum circuit” (QC)\, a linear ne twork that optimally distributes the squeezing generated at one of its inp uts among d simple (Mach-Zehnder or Ramsey) interferometers\, where d unkn own parameters are then imprinted and the number of particles at the outpu ts finally measured. For any given linear combination of the parameters\, we identify the optimal configuration of the QC that allows its estimation with maximal\, sub-shot-noise sensitivity. Our “entangled” strategy\, based on the mode-entanglement created by the QC\, outperforms the rival and more common “separable” strategy\, in which the same unknown param eters are estimated independently: the sensitivity gain being a factor d\, at most. We show that these results are robust against the noise which ma y arise in the sensor network. Our new scheme paves the ways to a variety of applications in distributed quantum sensing.\n\nhttps://indico.unina.it /event/58/contributions/586/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/586/ END:VEVENT BEGIN:VEVENT SUMMARY:Self-induced Josephson junction in a supersolid dipolar quantum ga s DTSTART;VALUE=DATE-TIME:20220830T165000Z DTEND;VALUE=DATE-TIME:20220830T170500Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-585@cern.ch DESCRIPTION:Speakers: Beatrice Donelli (QSTAR\, INO-CNR\, LENS\, Universit à degli studi di Napoli Federico II)\nSupersolid is a state of matter in which coexist both a periodic modulation\, characteristic of the solid sta te\, and the ability of the superfluid to flow without any friction. Its t heoretical prediction dates back to 1960s\, but it was experimentally obse rved for the first time few years ago\, in a dipolar quantum gas. This wor k is based on the idea of searching for coherent tunneling phenomena\, suc h as Josephson oscillations\, in this dipolar supersolid\, to demonstrate the superfluidity of the system. This phenomenon usually requires an exter nal potential barrier through which the tunneling arises\, but the intrins ic modulation of the supersolid creates minima in the potential\, which ac t as a self-induced barrier. This gives rise to a junction that can suppor t Josephson oscillations and the Macroscopic Quantum Self-Trapping regime . We have observed both phenomena using a 3D numerical simulation of an ex tended Gross-Pitaevskii equation (i.e. with the addition of first-order qu antum fluctuations) and predicted the location of this transtition through a theoretical model.\n\nhttps://indico.unina.it/event/58/contributions/58 5/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/585/ END:VEVENT BEGIN:VEVENT SUMMARY:Interfacing superconducting digital read-out circuit for optimal c ontrol DTSTART;VALUE=DATE-TIME:20220830T163500Z DTEND;VALUE=DATE-TIME:20220830T165000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-597@cern.ch DESCRIPTION:Speakers: Pasquale Mastrovito (University of Naples Federico I I)\nIn the last years\, superconducting circuits have passed from being in teresting physical devices to becoming one of the most promising contender s in the race towards the first fault-tolerant quantum computer [1]. \nIn this context Quantum Non-Demolition (QND) read-out of superconducting qubi ts becomes an essential step in most computational operations and in prote cting quantum information throughout them. QND read-out of superconducting qubits is usually achieved by detecting the frequency shift of a microwav e resonator coupled to the qubit under test [2].\nImprovements in terms of latency and scalability are not often discussed\, despite the increase in size and complexity of modern quantum processors [3]. In this context\, t he phase detection capability of Josephson junctions can be exploited to d evelop alternative schemes [4]. We have successfully characterized [5] a f lux tunable Josephson phase detector\, called Josephson Digital Phase Dete ctor (JDPD)\, that can be used to perform QND qubit read-out in situ by dy namically changing the applied flux through the two loops that define its structure. \nHere we present a study about optimization of control and rea d-out fidelity of the circuit. The optimization is based on finely enginee ring the coupling between the circuit loops and external flux sources. We show that the system can be inserted in a Single Flux Quantum (SFQ) logic [6] environment thanks to the JDPD ability to project the qubit state in o ne of his two flux states in the double well regime. Thanks to the SFQ tec hnology we are able to reach sampling frequencies in the GHz range. In add ition to that we show that thanks to the double-loop layout of the JDPD it is possible to protect the system from unwanted asymmetries due to flux n oise or fabrication issues.\n\nReferences\n[1] K. Morten\, et al. Annual R eview of Condensed Matter Physics 11: 369-395. (2020)\n[2] A. Wallraff\, e t al. Phys. Rev. Lett. 95\, 060501 (2005)\n[3] F. Arute\, et al. Nature\, 574.7779: 505-510. (2019)\n[4] A. Opremcak et al\, Physical Review X 11\, 011027\, February (2021) \n[5] L. Di Palma et al\, in prep. (2022)\n[6] O . Mukhanov\, IEEE Trans. Appl. Supercond.\, vol. 21\, no. 3\, June (2011)\ n\nhttps://indico.unina.it/event/58/contributions/597/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/597/ END:VEVENT BEGIN:VEVENT SUMMARY:Harmonic generation in SNAIL TWPA DTSTART;VALUE=DATE-TIME:20220830T162000Z DTEND;VALUE=DATE-TIME:20220830T163500Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-584@cern.ch DESCRIPTION:Speakers: ANNA LEVOCHKINA (University of Naples\, Federico ii\ , Physics department)\nA Josephson Travelling Wave Parametric Amplifier (T WPA) is a non-linear device which consists of a long array of repeating un it cells containing Josephson junctions. In our case the unit cell consist s of a superconducting loop with three large (high critical current) and o ne small (low critical current) Josephson junctions (so-called SNAIL-cell - superconducting nonlinear asymmetric inductive element [1]). The nonline arity of this device gives rise to parametric amplification: namely in pre sence of an intense input pump at frequency ωp and a weak input signal at frequency ωs\, the output signal will be amplified and the idler tone at frequency ωi = ωp – ωs will be generated. In addition\, due to the n onlinearity harmonic generation takes place\, affecting amplification perf ormance of TWPAs. In this work\, the appearance of harmonics in such devic e is studied in detail. \n\nOur experiment was carried out in the laborato ry of Quantum Technologies of Naples University Federico II. The TWPA was placed in a Triton cryostat of Oxford Instruments which was cooled down to 7 mK in order to achieve the necessary amplification. We used SNAIL TWPA consists of 700 unit cells [2]. The device was fabricated at Neel Institut e\, CNRS in Grenoble. For this device we experimentally observe the appear ance of second and third order harmonics in presence of pump and signal fo r different values of the external magnetic flux threading the SNAILs. We study harmonic generation at both zero and half magnetic flux quantum. The results of experiment are in agreement with the theory according to which the presence of second harmonic depends on nonlinearity β (three-wave mi xing coefficient) and third harmonic generation depends on γ (four-wave m ixing coefficient) [3]. Both β and γ depend on applied magnetic flux.\n\ nSimulation of SNAIL TWPAs with PSCAN2 software package (a circuit analyze r that supports Josephson junctions) was also performed for comparison wit h experimental data and analytic predictions. \n\n[1] N. E. Frattini\, U. Vool\, S. Shankar\, A. Narla\, K. M. Sliwa\, and M. H. Devoret\, “3-wave mixing Josephson dipole element\,” Appl. Phys. Lett\, vol. 110\, no. 22 \, pp. 1– 5\, 2017.\n\n[2] Arpit Ranadive\, Martina Esposito\, Luca Plan at \, Edgar Bonet \, Cécile Naud \, Olivier Buisson\, Wiebke Guichard1 & Nicolas Roch\, “Kerr reversal in Josephson meta-material and traveling w ave parametric amplification” Nature Communications\, volume 13\, articl e number: 1737 (2022)\n\n[3] A. B. Zorin\, “Josephson Traveling-Wave Par ametric Amplifier with Three-Wave Mixing\,” Physical Review Applied\, vo l. 6\, no. 3\, pp. 1–8\, 2016.\n\nhttps://indico.unina.it/event/58/contr ibutions/584/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/584/ END:VEVENT BEGIN:VEVENT SUMMARY:Digital qubit readout with a flux-switchable superconducting circu it DTSTART;VALUE=DATE-TIME:20220830T160000Z DTEND;VALUE=DATE-TIME:20220830T162000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-575@cern.ch DESCRIPTION:Speakers: LUIGI DI PALMA (Università Federico II Napoli)\nQua ntum computing platforms based on superconducting qubits have emerged as o ne of the most promising candidates in the race to build a large scale qua ntum computer [1]. \nControllability\, standard chips fabrication techniqu es combined with the possibility of exploring unconventional hybrid system s [2] are well established advantages of superconducting qubits architectu res as quantum processors.\nHowever\, while the performance of small super conducting quantum processors has advanced the threshold necessary for fau lt tolerance\, the current technique to control and readout the qubit stat e \nimposes severe system scaling challenges [3]. Within this framework\, digital control based on cryogenic energy-efficient superconducting Single Flux Quantum (SFQ) logic is being adapted to perform qubit control and re adout for scalable quantum 3D-architectures [4]. This is leading to the de velopment of innovative concepts for quantum processor control and benchma rking in this integrated digital-quantum hybrid system.\n\nHere\, we propo se an SFQ-compatible approach to accomplish diabatic readout of supercondu cting qubits based on a Josephson Digital Phase Detector (JDPD). When pro perly excited by flux bias pulse\, the JDPD is able to quickly switch from a single-minima to a double-minima potential and\, consequently\, relax i n one of the two stable configurations discriminating between two phase va lues of a coherent input tone at GHz frequency. The basic concepts behind this new readout scheme have been experimentally verified with a prelimina ry version of the JDPD. The capability to work as a phase detector has bee n demonstrated up to 100kHz tone with a remarkable agreement between the e xperimental outcomes and simulations [5].\n\nBy choosing design parameters \, the JDPD will be sensitive at frequency in the range of GHz\, the typic al frequency of superconducting qubits. These characteristics make the JDP D suitable for the implementation of a high speed platform integrated with superconducting digital electronics for both control and readout the qubi t’s state directly at 20 mK\, providing a solid solution for highly scal able superconducting quantum processors.\n\n[1] J. M. C. J. M. Gambetta an d M. Steffen\, “Superconducting quantum bits”\, NPJ Quantum Inf 2\, 1 (2017). \n[2] H. G. Ahmad et al.\, "Hybrid ferromagnetic transmon qubit: C ircuit design\, feasibility\, and detection protocols for magnetic fluctua tions" Phys. Rev. B\, 2022\n[3] O. Mukhanov et al.\, "Scalable Quantum Com puting Infrastructure Based on Superconducting Electronics" IEEE Internati onal Electron Devices Meeting (IEDM)\, 2019\, \n[4] R. McDermott et al.\, “Quantum–classical interface based on single flux quantum digital logi c”\, Quantum Science and technology 3 (2018). \n[5] Di Palma et al.\, “Discriminating the phase of a weak coherent tone with a flux-switchable \nsuperconducting circuit”\, in prep.\n\nhttps://indico.unina.it/event/5 8/contributions/575/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/575/ END:VEVENT BEGIN:VEVENT SUMMARY:Persistent Tensors: Multiqudit Version of Multiqubit ${\\rm{W}}$ S tate and Multiqudit Entanglement Transformation DTSTART;VALUE=DATE-TIME:20220829T165000Z DTEND;VALUE=DATE-TIME:20220829T171000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-582@cern.ch DESCRIPTION:Speakers: MASOUD GHARAHIGHAHI (University of Camerino)\nWe con struct a lower bound of the tensor rank for a class of tensors that we cal l them persistent tensors. In this class\, there is a specific subclass of tensors that the lower bound is tight. Indeed\, this subclass is $n$-qudi t version of $n$-qubit ${\\rm{W}}$ states (we call them $n$-qudit ${\\rm{M }}$ states denoted by $|{\\rm{M}}(d\,n)\\rangle$ and we have $\\mathcal{M} (2\,n)=\\mathcal{W}_n$). Consequently\, we show that one can obtain $n$-qu dit ${\\rm{M}}$ states from a generalized $n$-qudit ${\\rm{GHZ}}$ state vi a asymptotic Stochastic Local Operations and Classical Communication (SLOC C) with a rate approaching unity. We also show that the tensor rank of Kro necker product\, and hence\, tensor product of $m$-qudit ${\\rm{GHZ}}$ and $n$-qudit ${\\rm{M}}$ states is equal to the product of their tensor rank s\, i.e.\, $R\\big(\\mathcal{G}(d_1\,m)\\otimes\\mathcal{M}(d_2\,n)\\big)= d_1\\big((n-1)d_2-n+2\\big)$.\n\nhttps://indico.unina.it/event/58/contribu tions/582/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/582/ END:VEVENT BEGIN:VEVENT SUMMARY:Accelerating Monte Carlo Simulations via Quantum Annealers DTSTART;VALUE=DATE-TIME:20220829T171000Z DTEND;VALUE=DATE-TIME:20220829T172500Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-581@cern.ch DESCRIPTION:Speakers: Giuseppe Scriva (University of Camerino)\nSimulating the low-temperature equilibrium properties of a spin glass is notoriously a hard computational task. It plays a central role in condensed matter ph ysics\, and it is also related to relevant NP-hard optimization problems w hich can be mapped into spin models.\n\nDeep Learning (DL) models\, such a s generative neural networks can be used to accurately mimic Boltzmann dis tributions and to accelerate Monte Carlo simulations of classical statisti cal models. One of the bottlenecks of deep neural networks is the effort t o generate a proper dataset: in the spin glass\, for instance\, classical method to obtain data fail. Therefore\, we exploit D-Wave quantum annealer to produce adequate training datasets for the generative models.\n\nHybri d neural Metropolis algorithms will be described\, as well as the use of h ybrid quantum-classical training dataset. We obtain a remarkable suppressi on of the long correlation times that plague spin-glass simulations in the low-temperature regime and a precise reconstruction of the configuration energy distribution.\nThese results demonstrate that quantum devices\, com bined with DL algorithms\, allow tackling otherwise intractable computatio nal problem.\n\nhttps://indico.unina.it/event/58/contributions/581/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/581/ END:VEVENT BEGIN:VEVENT SUMMARY:Geometric corrections to cosmological entanglement DTSTART;VALUE=DATE-TIME:20220829T163500Z DTEND;VALUE=DATE-TIME:20220829T165000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-576@cern.ch DESCRIPTION:Speakers: Alessio Belfiglio (University of Camerino)\nWe inves tigate entanglement production by inhomogeneous perturbations over a homog eneous and isotropic cosmic background\, demonstrating that the interplay between quantum and geometric effects can have relevant consequences on en tanglement entropy\, with respect to homogeneous scenarios. To do so\, we focus on a conformally coupled scalar field and discuss how geometric prod uction of scalar particles leads to entanglement. Perturbatively\, at firs t order we find oscillations in entropy correction\, whereas at second ord er the underlying geometry induces mode-mixing on entanglement production. We thus quantify entanglement solely due to geometrical contribution and compare our outcomes with previous findings. We characterize the geometric contribution through geometric (quasi)-particles\, interpreted as dark ma tter candidates.\n\nhttps://indico.unina.it/event/58/contributions/576/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/576/ END:VEVENT BEGIN:VEVENT SUMMARY:Practical Limits on Large-Momentum-Transfer Clock Atom Interferome ters DTSTART;VALUE=DATE-TIME:20220829T160500Z DTEND;VALUE=DATE-TIME:20220829T162000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-571@cern.ch DESCRIPTION:Speakers: Mauro Chiarotti (Università Degli Studi di Firenze\ , Dipartimento di Fisica e Astronomia)\nAtom interferometry utilising sing le-photon optical transitions represents an emerging technology with the a bility to probe physics in a variety of previously untested regimes. Multi ple experiments based upon the clock transition of Sr at 698 nm have been proposed to search for a wide set of fundamental physics goals\, such as g ravitational wave detection. Crucial to meeting these experiments’ requi red sensitivities is the implementation of large momentum transfer (LMT)\, with very large enhancements of 1000-10000 ħk ultimately proposed for te rrestrial experiments currently in the development stage. In practice\, th is typically means increasing the momentum separation between the two path s of the wavepacket by applying a series of π pulses. Such a manipulation of the atom samples is highly susceptible to the noise performance of the interferometry laser: within the quantum community-framework of the opera tional fidelity\, we have been simulating the effect of the intensity and frequency noise on a single atom at rest interacting with resonant light. Our results\, considering a typical square pulse sequence\, show the chall enging nature of the proposed experiments\, suggesting that the limiting r ole played by the laser frequency spectrum must be accounted for when stud ying the practical feasibility of a gravimeter sequence. Particularly\, th e equivalent laser linewidth is required be considerably lower than has pr eviously been suggested. Within this framework\, we further present and an alyse two high-power\, frequency-stabilised laser sources designed to perf orm interferometry on the 1S0 -3P0 clock transitions of cadmium and stront ium\, respectively operating at 332 nm and 698 nm.\n\nhttps://indico.unina .it/event/58/contributions/571/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/571/ END:VEVENT BEGIN:VEVENT SUMMARY:Trace-molecule detection below the ppt level with cavity-enhanced photoacoustic spectroscopy DTSTART;VALUE=DATE-TIME:20220829T155000Z DTEND;VALUE=DATE-TIME:20220829T160500Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-570@cern.ch DESCRIPTION:Speakers: Jacopo Pelini (University of Naples "Federico II" \ , CNR-INO Florence)\nTrace-gas detection plays an important role in our mo dern society\, impacting sectors as energy production\, environmental moni toring\, transportation\, agriculture\, safety\, and security. During the last decade\, optical detection with ultra-high sensitivity\, down to the ppq level\, was demonstrated with cavity-ring down techniques [1]\, enabli ng laser sensors to enter areas as archaeology (radiocarbon dating)\, clim ate change monitoring\, biofuel control\, contaminant assessment for semic onductor industry and so on. More recently\, photoacoustic sensors based o n quartz tuning forks and silicon cantilever have shown great potential in achieving a sensitivity at the level of the techniques mentioned above\, especially when combined with narrow-linewidth mid-infrared lasers and hig h-finesse optical cavities [2-5]. In addition\, they have unique character istics of robustness\, wide dynamic range and compact size\, which make th em particularly attractive for in-field applications.\nHere\, the recent d evelopments in photoacoustic sensing combined with resonant cavities are d iscussed\, showing the potentiality of the technique towards sub-ppt trace -gas detection. The setup is based on a silicon cantilever as acoustic tra nsducer\, whose displacement is measured with a balanced Michelson interfe rometer. The cantilever is mounted in a home-made photoacoustic cell consi sting of a high-Q-factor acoustic resonator placed inside a high-finesse o ptical resonator. This design\, leveraging on a double standing wave effec t\, achieves a combined acoustic and optical amplification factor of sever al orders of magnitude with respect to the standard configuration\, thus s trongly enhancing the final detection sensitivity. For our proof-of-princi ple demonstration of the technique\, a mid-infrared quantum cascade laser at 4.5 µm is used\, addressing N2O rovibrational transitions. \n\n\nRefer ences\n[1] M.G. Delli Santi et al.\, “Biogenic Fraction Determination in Fuel Blends by Laser‐Based 14CO2 Detection”\, Advanced Photonics Rese arch 2\, 2000069 (2021)\n\n[2] G. Zhao et al.\, “High-resolution trace g as detection by sub-Doppler noise-immune cavity-enhanced optical heterodyn e molecular spectrometry”\, Opt. Express 27\, 17940 (2019)\n\n[3] S. Bor ri et al.\, “Intracavity quartz-enhanced photoacoustic sensor”\, Appl. Phys. Lett. 104\, 091114 (2014)\n\n[4] Z. Wang et al.\, “Doubly resonan t sub-ppt photoacoustic gas detection with eight decades dynamic range”\ , \nDOI:10.21203/rs.3.rs-431688/v1 (2021\, under review) \n\n[5] T. Tomber g et al.\, “Sub-parts-per-trillion level sensitivity in trace gas detect ion by cantilever-enhanced photo-acoustic spectroscopy”\, Sci. Rep. 8\, 1848 (2018)\n\nhttps://indico.unina.it/event/58/contributions/570/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/570/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum Illumination of Phase conjugate Receiver using Neyman Pear son target detecton test DTSTART;VALUE=DATE-TIME:20220829T153000Z DTEND;VALUE=DATE-TIME:20220829T155000Z DTSTAMP;VALUE=DATE-TIME:20260418T103839Z UID:indico-contribution-58-569@cern.ch DESCRIPTION:Speakers: Theerthagiri Lakshmanan (Research Scholar)\nTo detec t the presence or absence of an object in concealed thermal noise\, a para metric down conversion of a Gaussian squeezed entangled state is sent to s pace. In the environmental background\, the quantum illumination (QI) enta ngled state is always much better than the optimal classical illumination (CI) target detection. We can easily provide the prior probability using t he Neyman-Pearson technique rather than the Bayesian method. One of the pr imary advantages of quantum illumination receiver operating characteristic s is the ability to compare the superior performance of two experimental s etups. This paper compares the receiver operating characteristics of class ical homodyne detection\, optical parametric amplifier (OPA)\, and phase c onjugate (PCR) photon counts.\nWe demonstrate that the P CR configuration outperforms the other two scenarios and that the approximations of Ns ≪ 1 and NB ≫ 1 are compatible with the classical Gaussian distribution.\n\ nhttps://indico.unina.it/event/58/contributions/569/ LOCATION:Scuola Superiore di Catania URL:https://indico.unina.it/event/58/contributions/569/ END:VEVENT END:VCALENDAR