Quantum gravity witness via entanglement of masses: Casimir screening
Quantum gravity witness via entanglement of masses: Casimir screening
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DOI：
10.1103/physreva.102.062807
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
T. W. van de Kamp;Ryan J. Marshman;S. Bose;A. Mazumdar
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文献类型：
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作者：
T. W. van de Kamp;Ryan J. Marshman;S. Bose;A. Mazumdar
最近提出的量子引力诱导质量纠缠(QGEM)实验方案要求在原则上可以实现，但仍然非常雄心勃勃，物质波干涉计量学中的一组参数。出于简化实验实现的目的，本文考虑了一种略微改进的实验设计所允许的参数空间，该设计通过用薄的导电板隔开两个宏观干涉仪来减小两个球面中性试块之间的Casimir势。虽然这种设置将在导电板和质量之间重新引入卡西米尔势，但这种设计有几个优点。首先，量子引力引起的两个叠加质量之间的纠缠将不会有Casimir背景。其次，物质波干涉测量本身将得到极大的便利，允许质量$10^-16}-10^-15$kg和叠加大小$\Delta x\sim20\MU$m都比前面提出的小1-2个数量级，从而也使磁场梯度$10^4$TM$^-1}$小两个数量级，从而通过Stern-Gerlach效应产生这种叠加。在此背景下，我们将进一步研究由导电板的振动模式引起的碰撞退相干和退相干。
A recently proposed experimental protocol for Quantum Gravity induced Entanglement of Masses (QGEM) requires in principle realizable, but still very ambitious, set of parameters in matter-wave interferometry. Motivated by easing the experimental realization, in this paper, we consider the parameter space allowed by a slightly modified experimental design, which mitigates the Casimir potential between two spherical neutral test-masses by separating the two macroscopic interferometers by a thin conducting plate. Although this set-up will reintroduce a Casimir potential between the conducting plate and the masses, there are several advantages of this design. First, the quantum gravity induced entanglement between the two superposed masses will have no Casimir background. Secondly, the matter-wave interferometry itself will be greatly facilitated by allowing both the mass $10^{-16}-10^{-15}$kg and the superposition size $\Delta x \sim 20 \mu$m to be a one-two order of magnitude smaller than those proposed earlier, and thereby also two orders of magnitude smaller magnetic field gradient of $10^4$Tm$^{-1}$ to create that superposition through the Stern-Gerlach effect. In this context, we will further investigate the collisional decoherences and decoherence due to vibrational modes of the conducting plate.