量子SWITCH诱导的非马尔可夫性并非完全量子
Quantum SWITCH-induced non-Markovianity is not entirely quantum
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中文总结 AI 辅助
本研究通过分析离散时间演化和开放量子系统动力学映射两个场景，证明量子SWITCH产生的记忆效应并非真正量子非马尔可夫性，需重新审视不定因果序框架的量子优势来源。
中文摘要 AI 辅助
不定因果序将量子信息处理扩展至固定因果结构之外，量子SWITCH是其典型实现。通过对量子通道的不同顺序进行相干叠加，已证明量子SWITCH在通信、计算、计量学及相关任务中可提供操作优势。尽管取得了这些进展，支撑这些优势的物理资源仍不明确。近期研究进一步揭示，量子SWITCH可产生记忆效应，表现为非马尔可夫信息回流。本研究考察此类记忆的起源，确定其反映的是真正（量子）非马尔可夫性，还是源于经典起源。为此，我们分析两个代表性场景：一个基于离散时间演化，另一个通过开放量子系统中的动力学映射构建。结果表明，量子SWITCH产生的记忆效应并非真正的量子非马尔可夫性，这促使人们重新审视不定因果序框架中量子优势的来源。
英文摘要
Indefinite causal order extends quantum information processing beyond fixed causal structures, with the quantum SWITCH serving as its canonical realization. By coherently superposing different orders of quantum channels, the quantum SWITCH has been shown to provide operational advantages in communication, computation, metrology, and related tasks. Despite these advances, the physical resources responsible for these advantages remains unclear. Recent studies have further revealed that the quantum SWITCH can generate memory effects, manifested as non-Markovian information backflow. In this work, we examine the origin of such memory and determine whether they reflect genuine (quantum) non-Markovianity or instead arises from classical origin. To this end, we analyze two representative scenarios: one based on discrete-time evolution and another formulated through dynamical maps in open quantum systems. We show that the memory effects generated by the quantum SWITCH are not genuinely quantum non-Markovian, thereby prompting a re-examination of the source of quantum advantage in indefinite causal order frameworks.
