论文标题
盲人目击者解散量子干扰，而无需转移哪个路径信息
Blind witnesses quench quantum interference without transfer of which-path information
论文作者
论文摘要
我们建模两分支量子干扰装置的基本行为。随着通过路径的磁通量变化，量子干扰振荡在输出中可见。多个证人系统与每个分支进行现场耦合。每个证人国家都与设备状态纠缠在一起，但是对于我们的{\ em blind}目击者，哪个路径信息未转移到证人的量子状态 - 他们无法“看到”或记录哪个路径的经过。然而，这些最小见证人的存在迅速消除了量子干扰。因此，在证人国家中，这对腐烂至关重要，而是在包括证人在内的较大的希尔伯特空间中嵌入装置自由度的纠缠所必需的。干扰可见性的丧失可以理解为从不同路径到较大状态空间的相位取消的结果。
We model the fundamental behavior of a two-branch quantum interference device. Quantum interference oscillations are visible in the output as the magnetic flux through the paths is varied. Multiple witness systems are field-coupled to each branch. Each witness state entangles with the device state, but for our {\em blind} witnesses which-path information is not transferred to the quantum state of witnesses--they cannot "see" or make a record of which path is traversed. Yet the presence of these minimal witnesses rapidly quenches quantum interference. Thus, it is not the imprinting of which-path information in the witness states that is essential for decoherence, but simply the entanglement that embeds the device degrees of freedom in the larger Hilbert space that includes the witnesses. The loss of interference visibility can be understood as the result of phase cancellations from different paths through the larger state space.
