Quantum simulation of indefinite causal order induced quantum refrigeration

• URL: http://arxiv.org/abs/2101.07979v2
• Date: Mon, 21 Feb 2022 22:02:03 GMT
• Title: Quantum simulation of indefinite causal order induced quantum refrigeration
• Authors: Huan Cao, Ning-ning Wang, Zhih-Ahn Jia, Chao Zhang, Yu Guo, Bi-Heng Liu, Yun-Feng Huang, Chuan-Feng Li, and Guang-Can Guo
• Abstract summary: We use an optical quantum switch to experimentally investigate the application of indefinite causal order (ICO) in thermodynamic tasks. Our results suggest that the causal nonseparability can be a powerful resource for quantum thermodynamic tasks.
• Score: 5.914614177091212
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In the classical world, physical events always happen in a fixed causal order. However, it was recently revealed that quantum mechanics allows events to occur with indefinite causal order (ICO). In this study, we use an optical quantum switch to experimentally investigate the application of ICO in thermodynamic tasks. Specifically, we simulate the working system interacting with two identical thermal reservoirs in an ICO, observing the quantum heat extraction even though they are in thermal equilibrium where heat extraction is unaccessible by traditional thermal contact. Using such a process, we simulate an ICO refrigeration cycle and investigate its properties. We also show that by passing through the ICO channel multiple times, one can extract more heat per cycle and thus obtain a higher refrigeration performance. Our results suggest that the causal nonseparability can be a powerful resource for quantum thermodynamic tasks.

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