Gravitationally mediated entanglement: Newtonian field versus gravitons
Gravitationally mediated entanglement: Newtonian field versus gravitons
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DOI：
10.1103/physrevd.105.086001
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发表时间：
2022-04-05
影响因子：
5
通讯作者：
Wald, Robert M.
中科院分区：
文献类型：
--
作者：
Danielson, Daine L.;Satishchandran, Gautam;Wald, Robert M.
我们认为，如果一个物体的牛顿引力场可以介导与另一个物体的纠缠，那么产生牛顿引力场的物体也应该有可能直接与壳层引力子纠缠。我们的论点是通过重新审视先前由Belenchia等人分析的gedanken实验，这表明，一个大质量物体的量子叠加需要量子化的引力辐射和时空度规的局部真空涨落，以避免互补性和因果性的矛盾。我们提供了一个精确和严格的描述发生在这个gedanken实验中的纠缠和退相干效应，从而显着提高后的信封的估计Belenchia等人。也表明，他们的结论是有效的，在更一般的情况下。作为我们的分析的副产品，我们表明，在gedanken实验的协议下，有没有明确的区别之间的纠缠介导的牛顿引力场的身体和纠缠介导的壳层引力子发射的身体。这表明牛顿纠缠暗示了引力子纠缠的存在，并支持了牛顿纠缠的实验发现可以被视为暗示引力子存在的观点。
We argue that if the Newtonian gravitational field of a body can mediate entanglement with another body, then it should also be possible for the body producing the Newtonian field to entangle directly with on-shell gravitons. Our arguments are made by revisiting a gedankenexperiment previously analyzed by Belenchia et al., which showed that a quantum superposition of a massive body requires both quantized gravitational radiation and local vacuum fluctuations of the spacetime metric in order to avoid contradictions with complementarity and causality. We provide a precise and rigorous description of the entanglement and decoherence effects occurring in this gedankenexperiment, thereby significantly improving upon the back-of-the-envelope estimates given by Belenchia et al. and also showing that their conclusions are valid in much more general circumstances. As a by-product of our analysis, we show that under the protocols of the gedankenexperiment, there is no clear distinction between entanglement mediated by the Newtonian gravitational field of a body and entanglement mediated by on-shell gravitons emitted by the body. This suggests that Newtonian entanglement implies the existence of graviton entanglement and supports the view that the experimental discovery of Newtonian entanglement may be viewed as implying the existence of the graviton.