Complementarity and causal propagation of decoherence by measurement in relativistic quantum field theories
Complementarity and causal propagation of decoherence by measurement in relativistic quantum field theories
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DOI：
10.1103/physrevd.106.076018
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发表时间：
2022-05
影响因子：
5
通讯作者：
Y. Hidaka;S. Iso;Kengo Shimada
中科院分区：
文献类型：
--
作者：
Y. Hidaka;S. Iso;Kengo Shimada
为了揭示引力的量子本质，人们对牛顿引力势在物体间产生的纠缠进行了广泛的讨论。在本文中，我们进行了量子场论分析的一个稍微修改版本的gedanken实验的马里和同事。我们表明，由于存在一个检测器的退相干传播的延迟绿色的功能方面的光的速度，因为它应该是一致的相对论场理论的因果关系。场的量子性质，如量子涨落或用凯尔迪什绿色函数表示的引力子发射，在壳层粒子产生的退相干机制中也起着重要作用。我们还讨论了在我们的设置中，干涉的可见性和测量的可测量性之间的权衡关系，称为波粒二象性。
Entanglement generation by Newtonian gravitational potential between objects has been widely discussed to reveal the quantum nature of gravity. In this paper, we perform a quantum field theoretical analysis of a slightly modified version of the gedanken experiment by Mari and co-workers. We show that decoherence due to the presence of a detector propagates with the speed of light in terms of a retarded Green's function, as it should be consistent with causality of relativistic field theories. The quantum nature of fields, such as quantum fluctuations or emission of gravitons expressed in terms of the Keldysh Green's function also play important roles in the mechanism of decoherence due to on-shell particle creation. We also discuss the trade-off relation between the visibility of the interference and the distinguishability of the measurement, known as the wave particle duality, in our setup.