论文标题
测量未订购的相关功能，而无需逆转时间演变
Measuring out-of-time-ordered correlation functions without reversing time evolution
论文作者
论文摘要
超时订购的相关函数（OTOC）在热化，纠缠和量子混乱的研究中起着至关重要的作用，因为它们量化了由于复杂的相互作用而引起的量子信息的炒作。由于其超时订购的性质，OTOC难以通过实验测量。在这里，我们提出了一个不依赖时间演化的反转，在一系列实验设置中易于实现的OTOC测量协议。该协议既说明纯净和混合的初始状态，又适用于与环境自由度相互作用的系统。我们通过在表现出量子混乱的定期驱动的旋转中进行扰动的表征来证明我们的方案的应用。
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. Here 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. The protocol accounts for both pure and mixed initial states, and is applicable to systems that interact with environmental degrees of freedom. We demonstrate the application of our protocol by the characterization of scrambling in a periodically-driven spin that exhibits quantum chaos.
