Quantum superposition of massive objects and the quantization of gravity
Quantum superposition of massive objects and the quantization of gravity
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DOI：
10.1103/physrevd.98.126009
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发表时间：
2018-12-18
影响因子：
5
通讯作者：
Aspelmeyer, Markus
中科院分区：
文献类型：
--
作者：
Belenchia, Alessio;Wald, Robert M.;Aspelmeyer, Markus
我们分析了Gedanken实验先前考虑的马里等人。Rep. 6，22777（2016）.]它涉及在观察者爱丽丝和鲍勃的控制下带电和/或大质量物体（“粒子”）的量子叠加。在电磁的情况下，我们表明，量子化的电磁辐射（这会导致退相干的爱丽丝的粒子）和真空波动的电磁场（这限制了鲍勃的能力，本地化他的粒子，以更好地比一个电荷半径），都是必不可少的，以避免明显的悖论的因果关系和互补性。然后，我们分析这个Gedanken实验的引力版本。我们纠正了Mari et al. [Sci. Rep. 6，22777（2016）.]和Baym和Ozawa [Proc. Natl. Acad. Sci. U.S.A. 106，3035（2009）.]，他没有正确地解释孤立系统的质心守恒。我们表明，引力的情况下的分析是完全平行的电磁的情况下，提供的引力辐射是量子化的，真空涨落限制本地化的粒子不优于普朗克长度。这为（线性化的）引力应该有量子场描述的观点提供了支持。
We analyze a Gedankenexperiment previously considered by Mari et al. [Sci. Rep. 6, 22777 (2016).] that involves quantum superpositions of charged and/or massive bodies ("particles") under the control of the observers, Alice and Bob. In the electromagnetic case, we show that the quantization of electromagnetic radiation (which causes decoherence of Alice's particle) and vacuum fluctuations of the electromagnetic field (which limits Bob's ability to localize his particle to better than a charge-radius), both are essential for avoiding apparent paradoxes with causality and complementarity. We then analyze the gravitational version of this Gedankenexperiment. We correct an error in the analysis of Mari et al. [Sci. Rep. 6, 22777 (2016).] and of Baym and Ozawa [Proc. Natl. Acad. Sci. U.S.A. 106, 3035 (2009).], who did not properly account for the conservation of center of mass of an isolated system. We show that the analysis of the gravitational case is in complete parallel with the electromagnetic case, provided that gravitational radiation is quantized and that vacuum fluctuations limit the localization of a particle to no better than a Planck length. This provides support for the view that (linearized) gravity should have a quantum field description.