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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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BEGIN:VEVENT
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DTSTART;TZID=Europe/Paris:20240229T110000
DTEND;TZID=Europe/Paris:20240229T120000
DTSTAMP:20240221T154000
UID:MEC-4aeae10ea1c6433c926cdfa558d31134@lps.u-psud.fr
CREATED:20240221
LAST-MODIFIED:20240221
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:G.M.ANDOLINA:Dicke superradiant enhancement of the heat current in circuit QED
DESCRIPTION:\nCollective effects, such as Dicke superradiant emission, can enhance the performance of a quantum device. Here, we study the heat current flowing between a cold and a hot bath through an ensemble of N qubits, which are collectively coupled to the thermal baths.\n\nWe find a regime where the collective coupling leads to a quadratic scaling of the heat current with N in a finite-size scenario. Conversely, when approaching the thermodynamic limit, we prove that the collective scenario exhibits a parametric enhancement over the non-collective case. We then consider the presence of a third uncontrolled parasitic bath, interacting locally with each qubit, that models unavoidable couplings to the external environment. Despite having a non-perturbative effect on the steady-state currents, we show that the collective enhancement is robust to such an addition.\n\nFinally, we discuss the feasibility of realizing such a Dicke heat valve with superconducting circuits. Our findings indicate that in a minimal realistic experimental setting with two superconducting qubits, the collective advantage offers an enhancement of approximately 10% compared to the non-collective scenario.\n\n
URL:https://www.lps.u-psud.fr/events/templ-20042023-279/
ORGANIZER;CN=Andrej Mesaros:MAILTO:andrej.mesaros@universite-paris-saclay.fr
CATEGORIES:Séminaire de la Théorie de la Matière Condensée
LOCATION:Moyen amphi (LPS) + ONLINE (Zoom)
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