My discussions with John Stuart Bell

• URL: http://arxiv.org/abs/2210.16837v1
• Date: Sun, 30 Oct 2022 13:25:13 GMT
• Title: My discussions with John Stuart Bell
• Authors: Marian Kupczynski
• Abstract summary: In 1976, I met John Bell several times in CERN and we talked about a possible violation of optical theorem, purity tests, EPR paradox, Bell inequalities and their violation. I also reproduce handwritten notes, which I gave to Bell during our first meeting and a handwritten letter he sent to me in 1982. The research stimulated by Bell papers and experiments performed to check his inequalities led to several important applications of quantum entanglement in quantum information and quantum technologies.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In 1976, I met John Bell several times in CERN and we talked about a possible violation of optical theorem, purity tests, EPR paradox, Bell inequalities and their violation. I resume our discussions, and explain how they were related to my earlier research. I also reproduce handwritten notes, which I gave to Bell during our first meeting and a handwritten letter he sent to me in 1982. We have never met again, but I have continued to discuss BI-CHSH inequalities and their violation in several papers. The research stimulated by Bell papers and experiments performed to check his inequalities led to several important applications of quantum entanglement in quantum information and quantum technologies. Unfortunately, it led also to extraordinary metaphysical claims and speculations about quantum nonlocality and magic, which in our opinion John Bell would not endorse today. BI-CHSH inequalities are violated in physics and in cognitive science, but as members of so called probabilistic opposition have claimed for years, it neither proved the completeness of quantum mechanics nor its nonlocality. We hope that this year Nobel Prize laureates will explain that: one has to be cautious in drawing far-reaching philosophical conclusions from Bell inequalities.

Related papers

• Time series and the meaning of quantum non-locality [55.2480439325792]
  The derivation of Bell's inequalities gives precise meaning to the idea of quantum non-locality. It also makes evident why using it for faster than light signaling is impossible. It is demonstrated that series of outcomes, even if they violate Bell's inequalities, can be always embedded in a set of factual and counter-factual data.
  arXiv  Detail & Related papers  (2024-10-21T14:49:47Z)
• Consequences of the single-pair measurement of the Bell parameter [0.0]
  Bell inequalities represent a milestone for contemporary Physics. Strong debate is still ongoing on the actual meaning of Bell inequality tests. Recent work achieves for the first time an experimental estimation of the entire Bell-CHSH parameter from a single entangled pair.
  arXiv  Detail & Related papers  (2024-09-04T08:11:40Z)
• 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)
• Violation of Bell's Inequality in the Clauser-Horne-Shimony-Holt Form with Entangled Quantum States Revisited [0.0]
  We revisit the violation of Bell's inequality in the Clauser-Horne-Shimony-Holt form with entangled quantum states. We show how the extent of this violation depends both on the orientation of the polarizers and the degree of entanglement of the quantum states.
  arXiv  Detail & Related papers  (2023-02-27T18:55:43Z)
• Spin-1 photons, spin-1/2 electrons, Bell's inequalities, and Feynman's special perspective on quantum mechanics [0.0]
  The Einstein-Podolsky-Rosen (EPR) paradox that argues for the incompleteness of quantum mechanics as a description of physical reality has been put to rest by John Bell's famous theorem. We discuss several variants of the Bell inequalities and explore the ways in which they demolish the arguments in favor of local hidden-variable theories. We also examine the roots of Feynman's attitude toward Bell's theorem in the context of Feynman's special perspective on quantum mechanics.
  arXiv  Detail & Related papers  (2022-10-07T07:14:59Z)
• 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)
• Ruling out real-valued standard formalism of quantum theory [19.015836913247288]
  A quantum game has been developed to distinguish standard quantum theory from its real-number analog. We experimentally implement the quantum game based on entanglement swapping with a state-of-the-art fidelity of 0.952(1). Our results disprove the real-number formulation and establish the indispensable role of complex numbers in the standard quantum theory.
  arXiv  Detail & Related papers  (2021-03-15T03:56:13Z)
• Comment on "Nonlocality claims are inconsistent with Hilbert-space quantum mechanics" [0.0]
  The view exists that the Bell inequality is a mere inconsistent application of classical concepts to a well-established quantum world. We explain why a correct assessment of the Bell inequality does not in fact conflict with Griffiths's views of quantum locality.
  arXiv  Detail & Related papers  (2021-02-15T12:49:19Z)
• Non-Boolean Hidden Variables model reproduces Quantum Mechanics' predictions for Bell's experiment [91.3755431537592]
  Theory aimed to violate Bell's inequalities must start by giving up Boolean logic. "Hard" problem is to predict the time values when single particles are detected. "Soft" problem is to explain the violation of Bell's inequalities within (non-Boolean) Local Realism.
  arXiv  Detail & Related papers  (2020-05-20T21:46:35Z)
• Real or Not Real that is the question [0.0]
  Bell had a strong aversion against "quantum jumps" and insisted to be clear in phrasing quantum mechanics. Bell-type experiments and what Nature responded, and discuss the implications for the physical quantities considered. I would like to broaden and contrast the reality discussion with the concept of "virtuality", with the meaning of virtual particle occurring in quantum field theory.
  arXiv  Detail & Related papers  (2020-05-18T13:54:53Z)
• Bell's theorem for trajectories [62.997667081978825]
  A trajectory is not an outcome of a quantum measurement, in the sense that there is no observable associated with it. We show how to overcome this problem by considering a special case of our generic inequality that can be experimentally tested point-by-point in time.
  arXiv  Detail & Related papers  (2020-01-03T01:40:44Z)

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.