Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session G68: Superconducting Qubit Quantum Simulation and Algorithms
11:15 AM–2:03 PM,
Tuesday, March 3, 2020
Room: Four Seasons 4
Sponsoring
Unit:
DQI
Chair: David McKay, IBM TJ Watson Research Center
Abstract: G68.00004 : Quantum simulation in circuit QED: Observation of quantum many-body effects due to zero point fluctuations - II: Experiment*
Presenter:
Sebastien Leger
(Institut Neel)
Authors:
Sebastien Leger
(Institut Neel)
Javier Puertas
(Institut Neel)
Karthik Srikanth Bharadwaj
(Institut Neel)
Remy Dassonneville
(Institut Neel)
Jovian Delaforce
(Institut Neel)
Farshad Foroughi
(Institut Neel)
Vladimir Milchakov
(Institut Neel)
Luca Planat
(Institut Neel)
Olivier Buisson
(Institut Neel)
Cécile Naud
(Institut Neel)
Wiebke Guichard
(Institut Neel)
Serge Florens
(Institut Neel)
Izak Snyman
(Wits University)
Nicolas Roch
(Institut Neel)
effects such as the Lamb shift and the Casimir effect. In the traditional quantum optics domain, these corrections remain perturbative due to the smallness of the fine structure constant. To provide a direct observation of non-perturbative effects driven by ZPF in an open quantum system we wire a highly non-linear Josephson junction to a high impedance transmission line, allowing large phase fluctuations across the junction. Consequently, the resonance of the former acquires a relative frequency shift that is orders of magnitude larger than for natural atoms. Detailed modelling confirms that this renormalization is non-linear and quantum. Remarkably, the junction transfers its non-linearity to about 30 environmental modes, a striking back-action effect that transcends the standard Caldeira-Leggett paradigm. This work opens many exciting prospects for longstanding quests such as the tailoring of many-body Hamiltonians in the strongly non-linear regime, the observation of Bloch oscillations, or the development of high-impedance qubits.
*The speaker thanks the ANR-16-CE24-0005, ANR-14-CE26-0018, ANR-15-IDEX-02 and the CFM foundation.
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