Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session W73: Superconducting Qubits: cQED and Bosonic codes
3:00 PM–5:48 PM,
Thursday, March 9, 2023
Room: Room 405
Sponsoring
Unit:
DQI
Chair: Kevin O'Brien, Massachusetts Institute of Technology MI
Abstract: W73.00001 : Displacement oscillator: High order photon-photon interactions in a superconducting circuit (Part 2)
3:00 PM–3:12 PM
Presenter:
Alvise Borgognoni
(Mines ParisTech)
Authors:
Alvise Borgognoni
(Mines ParisTech)
Clarke Smith
(Ecole Normale Supérieure)
Marius Villiers
(Ecole Normale Supérieure)
Erwan Roverc'h
(Ecole Normale Supérieure)
Camille Berdou
(Ecole Normale Superieure)
Aron Vanselow
(Inria)
Natalia Pankratova
(Alice&Bob)
José Palomo
(Ecole Normale Supérieure)
Aurélie Pierret
(Ecole Normale Supérieure)
Takis Kontos
(Ecole Normale Supérieure)
Mazyar Mirrahimi
(Inria)
Benoit Doucot
(Sorbonne Université)
Philippe Campagne-Ibarcq
(Inria)
Zaki Leghtas
(Mines ParisTech)
A quantum harmonic oscillator perturbed by a Josephson junction nonlinearity has become ubiquitous in quantum science and engineering. In the usual regime, the fluctuations of the superconducting phase across the junction are small and the Josephson nonlinearity reduces to the Kerr effect, thereby enabling amplification of microwave signals and encoding of quantum information. In this experiment, we explore the new regime of large phase fluctuations, where the Josephson cosine potential is dominated by mixing terms even higher than fourth order. We expect peculiar effects in this extreme limit, such as the alternation of the sign of the oscillator frequency shift for each added photon, and even nonlocal quantum dynamics. In this two-part talk, we present the theoretical model of the system as well as experimental progress.
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