论文标题
干涉实验，异常弱价值和大牙的leggett-garg检验
Interference experiment, anomalous weak value and Leggett-Garg test of macrorealism
论文作者
论文摘要
大元主义是一种古典世界观点，断言宏观对象的特性独立存在，而与观察无关。在量子理论中测试这种观点的一种实际方法是观察干涉实验中宏观对象的量子相干性。一种在量子理论中测试大分现实主义概念的优雅而概念上吸引人的方法是违反了leggett-garg的不平等。但是，最终的Leggett-Garg测试取决于如何在实验中保证非侵入性可测量性标准，并且至今仍是一个争论的问题。在这项工作中，我们将通过弱价值测试大分现实主义的实用和概念方法联系起来。我们认为，每当在干扰实验中观察到量子效应时，就会存在异常弱值。此外，我们证明，每当存在这样的弱价值时，就会在任何干涉实验中都会违反leggett-garg不平等。由于该系统本身在仅路径干扰实验中充当设备，因此不能通过放弃非侵入性可测量性假设来挽救大分现实主义。我们对Leggett-Garg情景中涉及的假设以及我们的计划如何适合其中进行了严格的讨论。此外，使用准稳定性方法，我们解释了如何在我们的方案中满足非侵入性可测量性条件。
Macrorealism is a classical world view asserting that the properties of macro-objects exist independently and irrespective of observation. One practical approach to test this view in quantum theory is to observe the quantum coherence for macro-object in an interference experiment. An elegant and conceptually appealing approach for testing the notion of macrorealism in quantum theory is through the violation of Leggett-Garg inequality. However, a conclusive Leggett-Garg test hinges on how the non-invasive measurability criteria is guaranteed in an experiment and remains a debated issue till date. In this work, we connect the practical and the conceptual approaches for testing the macrorealism through the weak value. We argue that whenever quantum effect is observed in an interference experiment there is an existence of anomalous weak value. Further, we demonstrate that whenever such weak value exists, one obtains the violation of a Leggett-Garg inequality in any interference experiment. Since the system itself serves as apparatus in a path-only interference experiment, one cannot salvage the macrorealism by abandoning the non-invasive measurability assumption. We provide a rigorous discussion about the assumptions involved in Leggett-Garg scenario and how our scheme fits into it. Further, using the quasiprobability approach we explain how non-invasive measurability condition is satisfied in our scheme.
