19-22 giugno 2019
Strand Hotel Terme Delfini
Europe/Rome timezone

Fast high fidelity quantum non-demolition qubit readout via a non-perturbative cross-Kerr coupling

20 giu 2019, 16:00
30m
Strand Hotel Terme Delfini

Strand Hotel Terme Delfini

Ischia, Napoli
invited oral session 4

Speaker

Rémy Dassonneville (Institut Néel)

Description

Qubit readout is an indispensable element of any quantum information processor. In this work,
we propose an original coupling scheme between a qubit and a cavity mode based on a non-perturbative
cross-Kerr interaction. This scheme, using the same experimental techniques as the perturbative cross-Kerr coupling (dispersive interaction), leads to an alternative readout mechanism for superconducting qubits. This
new process, being non-perturbative, maximizes the speed of qubit readout, its single-shot readout fidelity and
its quantum non-demolition (QND) behavior at the same time, while minimizing the effect of unwanted decay channels such as, for example, the Purcell effect. We observed 97.4 % single-shot
readout fidelity for short 50 ns pulses. Using long measurement, we quantified the QND-ness to
99 %.

Primary authors

Rémy Dassonneville (Institut Néel) Tomas Ramos (Institute of Fundamental Physics, IFF-CSIC, Madrid, Sp) Vladimir Milchakov (Institut Néel, Grenoble, France) Luca Planat (Institut Néel, Grenoble, France) Etienne Dumur (Institut Néel, Grenoble, France) Farshad Foroughi (Institut Néel, Grenoble, France) Javier Puertas (Institut Néel, Grenoble, France) Sebastien Leger (Institut Néel, Grenoble, France) Karthik Bharadwaj (Institut Néel, Grenoble, France) Jovian Delaforce (Institut Néel, Grenoble, France) Cécile Naud (Institut Néel, Grenoble, France) Prof. Wiebke Hasch-Guichard (Institut Néel, Grenoble, France) Prof. Juan Jose Garcia-Ripoll (Institute of Fundamental Physics, IFF-CSIC, Madrid, Spain) Nicolas Roch (Institut Néel, Grenoble, France) Olivier Buisson (Institut Néel, Grenoble, France)

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