Yoon Tai Hyun, Cho Minhaeng
Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Seoul 02841, Republic of Korea.
Department of Physics, Korea University, Seoul 02841, Republic of Korea.
Sci Adv. 2021 Aug 18;7(34). doi: 10.1126/sciadv.abi9268. Print 2021 Aug.
To test the principle of complementarity and wave-particle duality quantitatively, we need a quantum composite system that can be controlled by experimental parameters. Here, we demonstrate that a double-path interferometer consisting of two parametric downconversion crystals seeded by coherent idler fields, where the generated coherent signal photons are used for quantum interference and the conjugate idler fields are used for which-path detectors with controllable fidelity, is useful for elucidating the quantitative complementarity. We show that the quanton source purity μ is tightly bounded by the entanglement between the quantons and the remaining degrees of freedom by the relation [Formula: see text], which is experimentally confirmed. We further prove that the experimental scheme using two stimulated parametric downconversion processes is an ideal tool for investigating and understanding wave-particle duality and Bohr's complementarity quantitatively.
为了定量测试互补原理和波粒二象性，我们需要一个可以由实验参数控制的量子复合系统。在这里，我们证明了一种双路径干涉仪，它由两个由相干闲频场注入的参量下转换晶体组成，其中产生的相干信号光子用于量子干涉，共轭闲频场用于具有可控保真度的路径探测器，这对于阐明定量互补性很有用。我们表明，量子源纯度μ 受量子与其余自由度之间的纠缠紧密限制，其关系为[公式：见原文]，这已通过实验得到证实。我们进一步证明，使用两个受激参量下转换过程的实验方案是定量研究和理解波粒二象性以及玻尔互补性的理想工具。
