论文标题
探测距离的量子相干性和aharonov-bohm非局部性
Probing quantum coherence at a distance and Aharonov-Bohm non-locality
论文作者
论文摘要
在标准的干涉测量实验中，通过重新组合梁切开器上的两个波数据包来测量两个路径之间的相位差。但是，最近已经认识到，该相也可以通过局部测量来通过在已知的叠加态下使用辅助粒子来估算。在这项工作中，我们进一步分析了这些方案的不同类型的颗粒（玻色子或费米子，充电或未充电），并特别强调了当相位归因于Abelian Gauge场的耦合时出现的微妙之处。在这种情况下，我们表明可测量的数量是4矢量电势的时空环积分，该积分由两个相同的粒子或粒子 - 腹膜对封闭。此外，我们将考虑因素概括为涉及在一般充电的费米子状态上进行本地测量的任意当事方的场景。最后，作为一种具体的应用，我们分析了Marletto和Vedral（Arxiv：1906.03440）的最新建议，涉及时间依赖性的Aharonov-Bohm效应。
In a standard interferometry experiment, one measures the phase difference between two paths by recombining the two wave packets on a beam-splitter. However, it has been recently recognized that the phase can also be estimated via local measurements, by using an ancillary particle in a known superposition state. In this work, we further analyse these protocols for different types of particles (bosons or fermions, charged or uncharged), with a particular emphasis on the subtleties that arise when the phase is due to the coupling to an abelian gauge field. In that case, we show that the measurable quantities are spacetime loop integrals of the 4-vector potential, enclosed by two identical particles or by a particle-antiparticle pair. Furthermore, we generalize our considerations to scenarios involving an arbitrary number of parties performing local measurements on a general charged fermionic state. Finally, as a concrete application, we analyse a recent proposal by Marletto and Vedral (arXiv:1906.03440) involving the time-dependent Aharonov-Bohm effect.
