Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session A26: Superconducting Circuits: Qubit Control and Entanglement
8:00 AM–11:00 AM,
Monday, March 4, 2019
BCEC
Room: 160B
Sponsoring
Unit:
DQI
Chair: Shannon Harvey, Harvard University
Abstract: A26.00011 : Probing the influence of many-body fluctuations on Cooper pair tunneling using circuit QED*
10:00 AM–10:12 AM
Presenter:
Sébastien Léger
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Authors:
Sébastien Léger
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Javier Puertas
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Luca Planat
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Remy Dassonneville
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Vladimir Milchakov
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Karthik Srikanth Bharadwaj
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Jovian Delaforce
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Farshad Foroughi
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Olivier Buisson
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Cecile Naud
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Wiebke Guichard
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Izak Snyman
(Mandelstam Institute for Theoretical Physics, School of Physics,University of the Witwatersrand, Johannesburg, South Africa)
Serge Florens
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Nicolas Roch
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France)
Because of the value of the hyperfine constant (~ 1/137) observing many body effects in light-matter interaction is challenging. Reaching this regime is now possible using the tools of circuit Quantum ElectroDynamics (cQED) [1,2].
In this work we investigate the interactions between the plasma modes propagating in arrays of more than 4000 SQUIDs (which simulate the light) and a small Josephson junction (the matter). The first effect of these modes is to broaden the energy level of the Josephson junction [1,2]. More interestingly they can also induce strong phase fluctuations across the junction, which directly affects the Cooper pair tunneling. We will present our on-going experimental efforts aimed at observing this purely quantum many-body effect.
[1] P. Forn-Díaz, et al. “Ultrastrong coupling of a single artificial atom to an electromagnetic continuum in the nonperturbative regime,” Nature Physics, 13(1), 39–43 (2016).
[2] J. Puertas Martínez, S.Léger, et al. “A tunable Josephson platform to explore many-body quantum optics in circuit-QED,” arXiv:1802.00633.
*This work was supported by the French Agence Nationale de la Recherche (ANR CLOUD project No. ANR-16-CE24-0005 and " Investissement d'avenir" ANR-15-IDEX-02) and the Capital Fund Management.
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