Synchronous observation of Bell nonlocality and state-dependent Kochen-Specker contextuality

• URL: http://arxiv.org/abs/2204.05385v2
• Date: Wed, 13 Apr 2022 12:48:17 GMT
• Title: Synchronous observation of Bell nonlocality and state-dependent Kochen-Specker contextuality
• Authors: Lei Xiao, Gabriel Ruffolo, Andr\'e Mazzari, Tassius Temistocles, Marcelo Terra Cunha, Rafael Rabelo, Peng Xue
• Abstract summary: Bell nonlocality and Kochen-Specker contextuality are nonclassical features of quantum theory. quantum systems cannot violate both inequalities concomitantly. A photonic experiment thus tests the synchronous violation of both CHSH and KCBS inequalities.
• Score: 3.406498743286058
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Bell nonlocality and Kochen-Specker contextuality are two remarkable nonclassical features of quantum theory, related to strong correlations between outcomes of measurements performed on quantum systems. Both phenomena can be witnessed by the violation of certain inequalities, the simplest and most important of which are the Clauser-Horne-Shimony-Holt (CHSH) and the Klyachko-Can-Binicio\v{g}lu-Shumovski (KCBS), for Bell nonlocality and Kochen-Specker contextuality, respectively. It has been shown that, using the most common interpretation of Bell scenarios, quantum systems cannot violate both inequalities concomitantly, thus suggesting a monogamous relation between the two phenomena. In this Letter, we show that the joint consideration of the CHSH and KCBS inequalities naturally calls for the so-called generalized Bell scenarios, which, contrary to the previous results, allows for joint violation of them. A photonic experiment thus tests the synchronous violation of both CHSH and KCBS inequalities. Our results agree with the theoretical predictions, thereby providing experimental proof of the coexistence of Bell nonlocality and Kochen-Specker contextuality in the simplest scenario, and shed new light for further explorations of nonclassical features of quantum systems.

Related papers

• A computational test of quantum contextuality, and even simpler proofs of quantumness [43.25018099464869]
  We show that an arbitrary contextuality game can be compiled into an operational "test of contextuality" involving a single quantum device. Our work can be seen as using cryptography to enforce spatial separation within subsystems of a single quantum device.
  arXiv  Detail & Related papers  (2024-05-10T19:30:23Z)
• Some consequences of Sica's approach to Bell's inequalities [55.2480439325792]
  Louis Sica derived Bell's inequalities from the hypothesis that the time series of outcomes observed in one station does not change if the setting in the other station is changed. In this paper, Sica's approach is extended to series with non ideal efficiency and to the actual time structure of experimental data.
  arXiv  Detail & Related papers  (2024-03-05T13:59:52Z)
• Experimental Test of Quantum Nonlocality from Contextuality [1.6114012813668932]
  Bell inequalities can be violated by state-independent contextuality sets. We show a new way to produce non-locality using orbital angular momentum entanglement in a bipartite photonic system.
  arXiv  Detail & Related papers  (2024-02-29T13:31:41Z)
• Insights into Quantum Contextuality and Bell Nonclassicality: A Study on Random Pure Two-Qubit Systems [0.0]
  We explore the relationship between Kochen-Specker quantum contextuality and Bell-nonclassicality for ensembles of two-qubit pure states. We present a comparative analysis showing that the violation of a noncontextuality inequality on a given quantum state reverberates on the Bell-nonclassicality of the considered state.
  arXiv  Detail & Related papers  (2023-10-13T12:14:11Z)
• An elegant proof of self-testing for multipartite Bell inequalities [0.0]
  This work presents a simple and broadly applicable self-testing argument for N-partite correlation Bell inequalities with two binary outcome observables per party. To showcase the versatility of our proof technique, we obtain self-testing statements for N party Mermin-Ardehali-Bei-Klyshko (MABK) and Werner-Wolf-Weinfurter-.Zukowski-Brukner (WWW.ZB) family of linear Bell inequalities.
  arXiv  Detail & Related papers  (2022-02-14T18:00:50Z)
• Experimental violations of Leggett-Garg's inequalities on a quantum computer [77.34726150561087]
  We experimentally observe the violations of Leggett-Garg-Bell's inequalities on single and multi-qubit systems. Our analysis highlights the limits of nowadays quantum platforms, showing that the above-mentioned correlation functions deviate from theoretical prediction as the number of qubits and the depth of the circuit grow.
  arXiv  Detail & Related papers  (2021-09-06T14:35:15Z)
• 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)
• Bell nonlocality in networks [62.997667081978825]
  Bell's theorem proves that quantum theory is inconsistent with local physical models. In the last decade, the investigation of nonlocality has moved beyond Bell's theorem to consider more sophisticated experiments. This review discusses the main concepts, methods, results and future challenges in the emerging topic of Bell nonlocality in networks.
  arXiv  Detail & Related papers  (2021-04-21T18:00:48Z)
• 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)
• Entanglement in Cognition violating Bell Inequalities Beyond Cirel'son's Bound [0.0]
  We present the results of two tests where a sample of human participants were asked to make judgements about conceptual combinations. Both tests significantly violate the Clauser-Horne-Shimony-Holt version of Bell inequalities (CHSH inequality') We show that the observed violations of the CHSH inequality can be explained as a consequence of a strong form of quantum entanglement' between the component conceptual entities.
  arXiv  Detail & Related papers  (2021-02-07T16:57:59Z)
• 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.