Quantum process inference for a single-qubit Maxwell demon
Quantum process inference for a single-qubit Maxwell demon
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DOI：
10.1103/physreva.104.022211
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发表时间：
2021-02
影响因子：
2.9
通讯作者：
Xingrui Song;M. Naghiloo;K. Murch
中科院分区：
文献类型：
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作者：
Xingrui Song;M. Naghiloo;K. Murch
虽然量子测量理论是建立在密度矩阵和可观测的基础上的，但热力学定律是基于热机和冰箱中使用的过程。量子热力学的研究融合了这两种截然不同的范式。在这篇文章中，我们强调了量子过程矩阵作为描述量子区域中热力学过程的统一语言的用法。我们在量子麦克斯韦恶魔的背景下实验证明了这一点，其中两个主要量通常被研究：平均功提取$\langW\Range$和效率$\Gamma$，其测量反馈操作使用所获得的信息的效率。利用量子过程矩阵的工具，我们发展了这两个量的最优反馈协议，并在超导电路QED装置中进行了实验研究。
While quantum measurement theories are built around density matrices and observables, the laws of thermodynamics are based on processes such as are used in heat engines and refrigerators. The study of quantum thermodynamics fuses these two distinct paradigms. In this article, we highlight the usage of quantum process matrices as a unified language for describing thermodynamic processes in the quantum regime. We experimentally demonstrate this in the context of a quantum Maxwell's demon, where two major quantities are commonly investigated; the average work extraction $\langle W \rangle$ and the efficacy $\gamma$ which measures how efficiently the feedback operation uses the obtained information. Using the tool of quantum process matrices, we develop the optimal feedback protocols for these two quantities and experimentally investigate them in a superconducting circuit QED setup.