Interference experiment, anomalous weak value and Leggett-Garg test of macrorealism

• URL: http://arxiv.org/abs/2012.13875v1
• Date: Sun, 27 Dec 2020 06:35:45 GMT
• Title: Interference experiment, anomalous weak value and Leggett-Garg test of macrorealism
• Authors: A. K. Pan
• Abstract summary: We argue that whenever quantum effect is observed in an interference experiment there is an existence of anomalous weak value. 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.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

Related papers

• Tests of macrorealism in meson oscillation physics [0.0]
  Macrorealism formalizes the intuitive notion that at any given time the system occupies a definite state. No-signaling-in-time conditions are found to be violated, revealing the impossibility of applying a macrorealistic description to the analysis of meson physics.
  arXiv  Detail & Related papers  (2024-02-20T10:55:04Z)
• Leggett-Garg test of macrorealism using indefinite causal order of measurements [0.0]
  The Leggett-Garg (LG) test is a conceptually elegant approach for probing the compatibility between the notion of macrorealism and quantum theory. We propose a simple and elegant scheme based on indefinite causal order in quantum switch experiment, which enables us to close this loophole.
  arXiv  Detail & Related papers  (2023-11-08T06:28:46Z)
• Measurement incompatibility is strictly stronger than disturbance [44.99833362998488]
  Heisenberg argued that measurements irreversibly alter the state of the system on which they are acting, causing an irreducible disturbance on subsequent measurements. This article shows that measurement incompatibility is indeed a sufficient condition for irreversibility of measurement disturbance. However, we exhibit a toy theory, termed the minimal classical theory (MCT), that is a counterexample for the converse implication.
  arXiv  Detail & Related papers  (2023-05-26T13:47:00Z)
• Test of macroscopic realism with coherent light [7.43265504719989]
  We report the LGI violation of path observable in a composite interference experiment with coherent light. Experiment results confirm the occurrence of destructive interference providing per se as evidence of macro-realism violation.
  arXiv  Detail & Related papers  (2023-02-17T10:56:19Z)
• Classical model of quantum interferometry tests of macrorealism [0.0]
  A recent experiment has used entangled light and negative measurements to demonstrate a loophole-free test of macrorealism. This paper shows that such an experiment, while soundly rejecting macrorealism, may nevertheless be open to a classical interpretation. A numerical analysis of the model shows good agreement with experimental observations and consistency with both local realism and a rejection of macrorealism.
  arXiv  Detail & Related papers  (2022-12-06T20:02:35Z)
• Incompatibility of observables, channels and instruments in information theories [68.8204255655161]
  We study the notion of compatibility for tests of an operational probabilistic theory. We show that a theory admits of incompatible tests if and only if some information cannot be extracted without disturbance.
  arXiv  Detail & Related papers  (2022-04-17T08:44:29Z)
• Quantum realism: axiomatization and quantification [77.34726150561087]
  We build an axiomatization for quantum realism -- a notion of realism compatible with quantum theory. We explicitly construct some classes of entropic quantifiers that are shown to satisfy almost all of the proposed axioms.
  arXiv  Detail & Related papers  (2021-10-10T18:08:42Z)
• Experimental test of quantum causal influences [0.6291681227094761]
  Quantum correlations can violate classical bounds on the causal influence even in scenarios where no violation of a Bell inequality is ever possible. We experimentally observe this new witness of nonclassicality for the first time.
  arXiv  Detail & Related papers  (2021-08-19T21:47:18Z)
• Observers of quantum systems cannot agree to disagree [55.41644538483948]
  We ask whether agreement between observers can serve as a physical principle that must hold for any theory of the world. We construct examples of (postquantum) no-signaling boxes where observers can agree to disagree.
  arXiv  Detail & Related papers  (2021-02-17T19:00:04Z)
• Experimental certification of nonclassicality via phase-space inequalities [58.720142291102135]
  We present the first experimental implementation of the recently introduced phase-space inequalities for nonclassicality certification. We demonstrate the practicality and sensitivity of this approach by studying nonclassicality of a family of noisy and lossy quantum states of light.
  arXiv  Detail & Related papers  (2020-10-01T09:03:52Z)
• Quantum Mechanical description of Bell's experiment assumes Locality [91.3755431537592]
  Bell's experiment description assumes the (Quantum Mechanics-language equivalent of the classical) condition of Locality. This result is complementary to a recently published one demonstrating that non-Locality is necessary to describe said experiment. It is concluded that, within the framework of Quantum Mechanics, there is absolutely no reason to believe in the existence of non-Local effects.
  arXiv  Detail & Related papers  (2020-02-27T15:04:08Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.