Abstract

Schemes to measure the presence or absence of interference depending on the entangled or nonentangled states in an initial biphoton field are proposed. The disappearance of interference in the ‘‘which way’’ scheme is shown to have nothing to do with the direct impact of the detector on the explored system. Sufficient information is provided by the channel that is used by a passing particle. It is shown that entanglement suppresses the one-photon interference but does not suppress biphoton interference, which can be observed using a scheme similar to the Franson type interference. Calculations are presented that confirm the efficiency of the proposed approach and our conclusions.

中文翻译：

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关于纠缠抑制的单光子干涉

摘要

提出了根据初始双光子场中的纠缠或非纠缠状态来测量干扰存在与否的方案。事实证明，“哪种方式”方案中干扰的消失与检测器对所研究系统的直接影响无关。通过的粒子所使用的通道提供了足够的信息。结果表明，纠缠抑制了单光子干扰，但没有抑制双光子干扰，这可以使用类似于Franson型干扰的方案观察到。计算结果证实了所提出方法的有效性和我们的结论。