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arXiv 1608.01640quant-ph
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对“粒子通过嵌套马赫-曾德尔干涉仪的路径”一文的评论

Comment on "Particle Path Through a Nested Mach-Zehnder Interferometer"

Hatim Salih

摘要:

在最近的一篇论文中,arXiv:1604.04596,格里菲斯质疑-基于一个信息一致的历史(CH)参数-反事实,为位的选择之一,萨利赫等人。的通信协议,而不发送物理粒子,物理学。110,170502(2013)。在这里,我们首先表明,用于解释我们的协议的马赫-曾德尔版本,没有家庭的一致的历史存在的任何历史有光子通过通信信道,从而使光子是否在通信信道中的问题从CH的观点是毫无意义的。然后,我们表明,对于实际的迈克尔逊型协议,有一致的历史家庭,包括历史的光子通过通信信道。我们证明了在通信信道中找到光子的概率为零-从而证明了完全的反事实性。

英文摘要:

In a recent paper, arXiv:1604.04596, Griffiths questioned - based on an informative consistent-histories (CH) argument - the counterfactuality, for one of the bit choices, of Salih et al.'s protocol for communicating without sending physical particles, Phys. Rev. Lett. 110, 170502 (2013). Here, we first show that for the Mach-Zehnder version used to explain our protocol, no family of consistent histories exists where any history has the photon travelling through the communication channel, thus rendering the question of whether the photon was in the communication channel meaningless from a CH viewpoint. We then show that for the actual Michelson-type protocol, there are consistent-histories families that include histories where the photon travels through the communication channel. We show that the probability of finding the photon in the communication channel is zero - thus proving complete counterfactuality.

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