Measuring out-of-time-ordered correlation functions without reversing time evolution
Measuring out-of-time-ordered correlation functions without reversing time evolution
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DOI：
10.1103/physreva.106.042429
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发表时间：
2020-03
影响因子：
2.9
通讯作者：
Philip Daniel Blocher;S. Asaad;V. Mourik;Mark A. Johnson;A. Morello;K. Mølmer
中科院分区：
文献类型：
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作者：
Philip Daniel Blocher;S. Asaad;V. Mourik;Mark A. Johnson;A. Morello;K. Mølmer
无序相关函数（OTOC）在热化、纠缠和量子混沌的研究中起着至关重要的作用，因为它们量化了由于复杂相互作用而导致的量子信息的混乱。由于它们的非时间有序性质，OTOC很难通过实验测量。在这封信中，我们提出了一个OTOC测量协议，不依赖于时间演化的逆转，很容易实现在一系列的实验设置。我们展示了我们的协议的应用程序的量子混沌的表征周期性驱动的自旋。
Out-of-time-ordered correlation functions (OTOCs) play a crucial role in the study of thermalization, entanglement, and quantum chaos, as they quantify the scrambling of quantum information due to complex interactions. As a consequence of their out-of-time-ordered nature, OTOCs are difficult to measure experimentally. In this Letter we propose an OTOC measurement protocol that does not rely on the reversal of time evolution and is easy to implement in a range of experimental settings. We demonstrate application of our protocol by the characterization of quantum chaos in a periodically driven spin.