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arXiv 2007.00458quant-phastro-ph.COhep-th
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双模压缩态的二分时间贝尔不等式

Bipartite temporal Bell inequalities for two-mode squeezed states

Kenta Ando, Vincent Vennin

摘要:

二分时间贝尔不等式类似于通常的贝尔不等式,除了在每次测量时改变偏振器的方向,而是改变执行测量的时间。通过这样做,人们能够测试真实性和局部性,但仅依赖于位置测量。这在无法探测动量方向的实验设置中特别有用(例如宇宙学)。我们研究了双模压缩态下连续系统的二分时间贝尔不等式,发现在参数空间中某些区域确实违反了这些不等式。我们强调的旋转角所发挥的作用,这是一个双模压缩态的三个参数(其他两个是压缩振幅和压缩角)的特征之一。在单次测量中,它只决定波函数的整体相位,因此可以被丢弃,但在多次测量中,它的时间动力学变得相关,并决定何时可以违反二分时间贝尔不等式。我们的研究为观察贝尔不等式违反开辟了新的实验设计的可能性。

英文摘要:

Bipartite temporal Bell inequalities are similar to the usual Bell inequalities except that, instead of changing the direction of the polariser at each measurement, one changes the time at which the measurement is being performed. By doing so, one is able to test for realism and locality, but relying on position measurements only. This is particularly useful in experimental setups where the momentum direction cannot be probed (such as in cosmology for instance). We study these bipartite temporal Bell inequalities for continuous systems placed in two-mode squeezed states, and find some regions in parameter space where they are indeed violated. We highlight the role played by the rotation angle, which is one of the three parameters characterising a two-mode squeezed state (the other two being the squeezing amplitude and the squeezing angle). In single-time measurements, it only determines the overall phase of the wavefunction and can therefore be discarded, but in multiple-time measurements, its time dynamics becomes relevant and crucially determines when bipartite temporal Bell inequalities can be violated. Our study opens up the possibility of new experimental designs for the observation of Bell inequality violations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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