论文标题
仪器特异性量子记忆效应和非马克维亚过程恢复的实验证明
Experimental Demonstration of Instrument-specific Quantum Memory Effects and Non-Markovian Process Recovery for Common-Cause Processes
论文作者
论文摘要
记忆效应的持续时间，强度和结构是物理进化的关键特性。由于量子测量的侵入性性质，必须根据所采用的探测工具来定义此类性能。在这里，使用光子平台，我们通过两个范式过程在实验上证明了这种必要性：第一个过程中的未来历史相关性可以通过中间量子测量来消除；对于第二个过程，嘈杂的经典测量会阻止历史的影响。然后，我们应用内存截断技术来恢复有效的描述，该描述近似于多时间可观察物的期望值。我们的原则分析为有关更通用的非马克维亚量子过程的实验铺平了道路，并突出了标准开放系统技术破裂的地方。
The duration, strength and structure of memory effects are crucial properties of physical evolution. Due to the invasive nature of quantum measurement, such properties must be defined with respect to the probing instruments employed. Here, using a photonic platform, we experimentally demonstrate this necessity via two paradigmatic processes: future-history correlations in the first process can be erased by an intermediate quantum measurement; for the second process, a noisy classical measurement blocks the effect of history. We then apply memory truncation techniques to recover an efficient description that approximates expectation values for multi-time observables. Our proof-of-principle analysis paves the way for experiments concerning more general non-Markovian quantum processes and highlights where standard open systems techniques break down.
