Consistent Quantum Causes

• URL: http://arxiv.org/abs/2303.13617v2
• Date: Thu, 1 Feb 2024 17:07:02 GMT
• Title: Consistent Quantum Causes
• Authors: Robert B. Griffiths
• Abstract summary: It justifies the usual laboratory intuition that properly tested apparatus can reveal the earlier microscopic cause. The difficulties encountered in an approach known as Quantum Causal Models can be traced to its lack of a satisfactory theory of quantum random processes.
• Score: 2.1756081703276
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: Developing a quantum analog of the modern classical theory of causation, as formulated by Pearl and others using directed acyclic graphs, requires a theory of random or stochastic time development at the microscopic level, where the noncommutation of Hilbert-space projectors cannot be ignored. The Consistent Histories approach provides such a theory. How it works is shown by applying it to simple examples involving beam splitters and a Mach-Zehnder interferometer. It justifies the usual laboratory intuition that properly tested apparatus can reveal the earlier microscopic cause (e.g., radioactive decay) of a later macroscopic outcome. The general approach is further illustrated by how it resolves the Bell inequalities paradox. The difficulties encountered in an approach known as Quantum Causal Models can be traced to its lack of a satisfactory theory of quantum random processes.

Related papers

• Beable-guided measurement theory [0.0]
  We investigate the genesis of the quantum randomness in the de Broglie's theory in more details. We show that the strong fluctuations of beable parameters arise randomising the system in accordance with the uncertainty relation.
  arXiv  Detail & Related papers  (2024-04-15T17:01:22Z)
• Testing Quantum Gravity using Pulsed Optomechanical Systems [13.650870855008112]
  We consider the Schr"odinger-Newton (SN) theory and the Correlated Worldline (CWL) theory, and show that they can be distinguished from conventional quantum mechanics. We find that discriminating between the theories will be very difficult until experimental control over low frequency quantum optomechanical systems is pushed further.
  arXiv  Detail & Related papers  (2023-11-03T17:06:57Z)
• Non-Abelian braiding of graph vertices in a superconducting processor [144.97755321680464]
  Indistinguishability of particles is a fundamental principle of quantum mechanics. braiding of non-Abelian anyons causes rotations in a space of degenerate wavefunctions. We experimentally verify the fusion rules of the anyons and braid them to realize their statistics.
  arXiv  Detail & Related papers  (2022-10-19T02:28:44Z)
• Efficient Distinction between Quantum Direct and Common Causes and its Experimental Verification [15.082156478846654]
  We introduce a quantity named Causal Determinant' to efficiently identify the quantum causal structures between two quantum systems. According to the causal determinant, the quantum direct cause imposed by an arbitrary unitary operator can be perfectly discriminated with the quantum common cause.
  arXiv  Detail & Related papers  (2022-03-05T14:12:37Z)
• 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)
• Quantum Causal Inference in the Presence of Hidden Common Causes: an Entropic Approach [34.77250498401055]
  We put forth a new theoretical framework for merging quantum information science and causal inference by exploiting entropic principles. We apply our proposed framework to an experimentally relevant scenario of identifying message senders on quantum noisy links. This approach can lay the foundations of identifying originators of malicious activity on future multi-node quantum networks.
  arXiv  Detail & Related papers  (2021-04-24T22:45:50Z)
• Classical model of delayed-choice quantum eraser [0.0]
  Wheeler's delayed-choice experiment was conceived to illustrate the paradoxical nature of wave-particle duality in quantum mechanics. In the experiment, quantum light can exhibit either wave-like interference patterns or particle-like anti-correlations. A variant known as the quantum eraser uses entangled light to recover the lost interference in a seemingly nonlocal and retrocausal manner.
  arXiv  Detail & Related papers  (2021-01-09T14:47:28Z)
• Experimental study of decoherence of the two-mode squeezed vacuum state via second harmonic generation [19.5474623165562]
  We report a novel scheme on the study of decoherence of a two-mode squeezed vacuum state via its second harmonic generation signal. Our scheme can directly extract the decoherence of the phase-sensitive quantum correlation $langle hatahatbrangle$ between two entangled modes. This is an experimental study on the decoherence effect of a squeezed vacuum state, which has been rarely investigated.
  arXiv  Detail & Related papers  (2020-12-22T05:38:24Z)
• Probing the Universality of Topological Defect Formation in a Quantum Annealer: Kibble-Zurek Mechanism and Beyond [46.39654665163597]
  We report on experimental tests of topological defect formation via the one-dimensional transverse-field Ising model. We find that the quantum simulator results can indeed be explained by the KZM for open-system quantum dynamics with phase-flip errors. This implies that the theoretical predictions of the generalized KZM theory, which assumes isolation from the environment, applies beyond its original scope to an open system.
  arXiv  Detail & Related papers  (2020-01-31T02:55:35Z)
• Driving Quantum Correlated Atom-Pairs from a Bose-Einstein Condensate [0.0]
  We investigate one such control protocol that demonstrates the resonant amplification of quasimomentum pairs from a Bose-Einstein condensate. A classical external field that excites pairs of particles with the same energy but opposite momenta is reminiscent of the coherently-driven nonlinearity in a parametric amplifier crystal.
  arXiv  Detail & Related papers  (2020-01-08T00:11:26Z)
• 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.