论文标题
量子时间叠加：QFT的情况
Quantum Temporal Superposition: the case of QFT
论文作者
论文摘要
量子场理论完全以时空点之间的场相关为特征。反过来，其中一些可以通过局部耦合到现场简单量子系统（又称粒子检测器）来访问。在这项工作中，我们考虑当检测器在不同时空点上的量子对照叠加的叠加时会发生什么，以探测该场的相关性。我们表明，由于量子干扰效应，两个检测器可以获取有关场相关的信息，而这些探测器否则就无法访问。这对信息理论量有相关的后果，例如纠缠和从现场收获的相互信息。特别是，量子控制允许在证明这是不可能的情况下提取纠缠。
Quantum field theory is completely characterized by the field correlations between spacetime points. In turn, some of these can be accessed by locally coupling to the field simple quantum systems, a.k.a. particle detectors. In this work, we consider what happens when a quantum-controlled superposition of detectors at different space-time points is used to probe the correlations of the field. We show that, due to quantum interference effects, two detectors can gain information on field correlations which would not be otherwise accessible. This has relevant consequences for information theoretic quantities, like entanglement and mutual information harvested from the field. In particular, the quantum control allows for extraction of entanglement in scenarios where this is otherwise provably impossible.
