Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Z02: Experimental Advances and Open Quantum Systems in the Thermodynamic Regime
11:30 AM–2:18 PM,
Friday, March 10, 2023
Room: Room 125
Sponsoring
Units:
GSNP DQI
Chair: Gabriel Landi, University of Rochester
Abstract: Z02.00010 : Universal Scaling Bounds on a Quantum Heat Current*
1:18 PM–1:30 PM
Presenter:
Shunsuke Kamimura
(University of Tsukuba)
Authors:
Shunsuke Kamimura
(University of Tsukuba)
Kyo Yoshida
(University of Tsukuba)
Yasuhiro Tokura
(University of Tsukuba)
Yuichiro Matsuzaki
(AIST)
In this talk, we present an upper bound on the heat current J, which is universally applicable for an arbitrarily chosen open quantum system. As the first main result, we obtained a scaling bound |J| ≤ Θ(L^3) for an L-particle open quantum system in a limit of large L, and we construct an example that achieves this scaling bound utilizing an L-body interaction induced by the environment. To consider more feasible cases, we impose an additional constraint that the system-environment interaction induces transitions between two system energy eigenstates having a smaller energy difference than a certain value ?E. Then, we obtained another scaling bound |J| ≤ Θ(L^{2+p}) that explicitly depends on ?E = Θ(L^p), and we also found that the so-called superradiance achieves this scaling bound |J| ≤ Θ(L^2) for a case of ?E = Θ(L^0).
*MEXT's Leading Initiative for Excellent Young Researchers, JST COI-NEXT program (No. JPMJPF2014), JST PRESTO (No. JP- MJPR1919), JSPS KAKENHI (No. 20H01827) and JST's Moonshot R&D (No. JPMJMS2061)
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