BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Dressed emitters as impurities DTSTART;VALUE=DATE-TIME:20211013T132000Z DTEND;VALUE=DATE-TIME:20211013T134500Z DTSTAMP;VALUE=DATE-TIME:20261017T060425Z UID:indico-contribution-84-438@cern.ch DESCRIPTION:Speakers: Luca Leonforte (Università degli studi di Palermo)\ nHere\, we present a compact formulation of the resolvent-based theory for calculating atom-photon dressed states built on the idea that the atom be haves as an effective impurity *(i)*. This establishes an explicit connect ion with the standard impurity problem in condensed matter. When the impur ity reduces to a vacancy\, the resulting class of dressed states play a ce ntral role in the emerging area of topological quantum optics *(ii)* in th at any topologically-robust dressed state is a VDS *(iii)*.\n\n*(i)* L. Le onforte\, D. Valenti\, B. Spagnolo\, A. Carollo\, F. Ciccarello\, arXiv:21 08.11963\n\n*(ii)* M. Bello\, G. Platero\, J. I. Cirac\, and A. González- Tudela\, Sci. Adv. 5\, eaaw0297 (2019)\n\n*(iii)* L. Leonforte\, A. Caroll o\, F. Ciccarello\, PRL 126\, 063601 (2021)\n\nhttps://indico.unina.it/eve nt/52/contributions/438/ LOCATION: URL:https://indico.unina.it/event/52/contributions/438/ END:VEVENT BEGIN:VEVENT SUMMARY:Entanglement detection in Noisy Intermediate-Scale Quantum devices DTSTART;VALUE=DATE-TIME:20211013T125500Z DTEND;VALUE=DATE-TIME:20211013T132000Z DTSTAMP;VALUE=DATE-TIME:20261017T060425Z UID:indico-contribution-84-394@cern.ch DESCRIPTION:Speakers: Vittorio Vitale (SISSA)\nWith the recent advent of n oisy intermediate-scale quantum devices implemented in various platforms\, entanglement and quantum coherence detection are in the focus of interest . We propose an ordered set of experimentally accessible conditions for de tecting entanglement in mixed states. The k-th condition involves comparin g moments of the partially-transposed density operator up to order k. Our empirical studies highlight that the first four conditions already detect mixed state entanglement reliably in a variety of architectures. Exploitin g symmetries can help to further improve their detection capabilities. We also show how to estimate moment inequalities based on local random measur ements of single state copies (classical shadows). We illustrate the metho d by applying it to a variety of physical systems and to experimental data .\n\nhttps://indico.unina.it/event/52/contributions/394/ LOCATION: URL:https://indico.unina.it/event/52/contributions/394/ END:VEVENT BEGIN:VEVENT SUMMARY:Light-Matter interactions in synthetic magnetic fields: Landau-Pho ton polaritons DTSTART;VALUE=DATE-TIME:20211013T143500Z DTEND;VALUE=DATE-TIME:20211013T150000Z DTSTAMP;VALUE=DATE-TIME:20261017T060425Z UID:indico-contribution-84-398@cern.ch DESCRIPTION:Speakers: Daniele De Bernardis (BEC-CNR-INFM and Dipartimento di Fisica\, Università di Trento\, I-38050 Povo\, Italy and)\nWe study li ght-matter interaction in two dimensional photonic systems in the presence of a spa- tially homogeneous synthetic magnetic field for light. Specific ally\, we consider one or more two-level emitters located in the bulk regi on of the lattice\, where for increasing magnetic field the photonic modes change from extended plane waves to circulating Landau levels. This chang e has a drastic effect on the resulting emitter-field dynamics\, which bec omes intrinsically non-Markovian and chiral\, leading to the formation of strongly coupled Landau-photon polaritons. The peculiar dynamical and spec tral properties of these quasi-particles can be probed with state-of-the-a rt photonic lattices in the optical and the microwave domain and may find various applications for the quantum simulation of strongly interacting to pological models.\n\nhttps://indico.unina.it/event/52/contributions/398/ LOCATION: URL:https://indico.unina.it/event/52/contributions/398/ END:VEVENT BEGIN:VEVENT SUMMARY:Few- and many-body photon bound states in quantum nonlinear media DTSTART;VALUE=DATE-TIME:20211013T141000Z DTEND;VALUE=DATE-TIME:20211013T143500Z DTSTAMP;VALUE=DATE-TIME:20261017T060425Z UID:indico-contribution-84-397@cern.ch DESCRIPTION:Speakers: Giuseppe Calajo (ICFO)\nThe emergence of multi-photo n bound states is an intriguing phenomenon that can occur in quite differe nt quantum nonlinear media\, such as arrays of quantum emitters coupled to photonic waveguides and Rydberg atomic ensembles. \nTo theoretical study these bound states within an unified framework\n we propose a spin-model f ormulation of quantum atom-light interactions. We solve the few- and many- body correlated dynamics of such states\, investigating how their propagat ing properties within the media manifest themselves in the spatio-temporal correlations of the output field. For sufficiently large photon number we recover a classical soliton-like behavior that suggests that a quantum-to -classical transition from quantum bound states to classical solitons is a general property inherent to quantum nonlinear media.\n\nhttps://indico.u nina.it/event/52/contributions/397/ LOCATION: URL:https://indico.unina.it/event/52/contributions/397/ END:VEVENT BEGIN:VEVENT SUMMARY:Exotic interactions mediated by a non-Hermitian photonic bath DTSTART;VALUE=DATE-TIME:20211013T134500Z DTEND;VALUE=DATE-TIME:20211013T141000Z DTSTAMP;VALUE=DATE-TIME:20261017T060425Z UID:indico-contribution-84-396@cern.ch DESCRIPTION:Speakers: Federico Roccati (Università degli Studi di Palermo )\nWe study the exotic interaction between emitters mediated by the photon ic modes of a lossy photonic lattice described by a non-Hermitian Hamilton ian\, where structured losses can seed exotic emission properties. Photon s can mediate dissipative\, fully non-reciprocal\, interactions between em itters with range critically dependent on the loss rate. At the bare-latti ce exceptional point\, the effective couplings are exactly nearest-neighbo ur\, implementing a dissipative\, fully non-reciprocal\, Hatano-Nelson mod el. Counter-intuitively\, this occurs irrespective of the lattice boundary conditions. Thus photons can mediate an effective emitters’ Hamiltonian which is translationally-invariant despite the fact that the field is not . We interpret these effects in terms of metastable atom-photon dressed st ates\, which can be exactly localized on only two lattice cells or extende d across the entire lattice.\n\nhttps://indico.unina.it/event/52/contribut ions/396/ LOCATION: URL:https://indico.unina.it/event/52/contributions/396/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum decay at short\, intermediate\, and long times: Observatio n in integrated photonics DTSTART;VALUE=DATE-TIME:20211013T123000Z DTEND;VALUE=DATE-TIME:20211013T125500Z DTSTAMP;VALUE=DATE-TIME:20261017T060425Z UID:indico-contribution-84-393@cern.ch DESCRIPTION:Speakers: Francesco Pepe ()\nThe decay of an unstable system i s usually described by an exponential law. However\, quantum mechanics gen erally predicts deviations from the exponential at both short and long tim es. The latter case\, in which a power-law decay is predicted\, is particu larly elusive\, as its onset commonly occurs when the survival probability is heavily depleted. We describe a hopping model on a semi-infinite array \, in which a power-law quantum decay can be observed. We report the exper imental observation non-exponential decay dynamics\, including power-law r egimes\, in arrays of parallel single-mode optical waveguides\, fabricated by femtosecond laser direct inscription. We finally comment on the featur es of state propagation in the array\, highlighting the behavior of wavefr onts.\n\nhttps://indico.unina.it/event/52/contributions/393/ LOCATION: URL:https://indico.unina.it/event/52/contributions/393/ END:VEVENT END:VCALENDAR