Quantum nonlocality in presence of strong measurement dependence

• URL: http://arxiv.org/abs/2209.02337v1
• Date: Tue, 6 Sep 2022 09:47:58 GMT
• Title: Quantum nonlocality in presence of strong measurement dependence
• Authors: Ivan \v{S}upi\'c, Jean-Daniel Bancal, Nicolas Brunner
• Abstract summary: We consider models with strong measurement-dependent locality, where measurement choices can be perfectly determined in almost all rounds of the Bell test. We conjecture that quantum nonlocality can still be observed in this scenario, which we conjecture is minimal within the framework we use.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: It is well known that the effect of quantum nonlocality, as witnessed by violation of a Bell inequality, can be observed even when relaxing the assumption of measurement independence, i.e. allowing for the source to be partially correlated with the choices of measurement settings. But what is the minimal amount of measurement independence needed for observing quantum nonlocality? Here we explore this question and consider models with strong measurement-dependent locality, where measurement choices can be perfectly determined in almost all rounds of the Bell test. Yet, we show that quantum nonlocality can still be observed in this scenario, which we conjecture is minimal within the framework we use. We also discuss potential applications in randomness amplification.

Related papers

• A Family of Local Deterministic Models for Singlet Quantum State Correlations [0.0]
  We introduce a new class of local deterministic models that account for both particle preparation and measurement settings. Our model reproduces the quantum mechanical predictions under the assumption of relaxed measurement independence. Our findings highlight the nuanced relationship between local determinism and quantum mechanics, offering new insights into the nature of quantum correlations and hidden variables.
  arXiv  Detail & Related papers  (2024-08-18T19:38:15Z)
• To Believe or Not to Believe Your LLM [51.2579827761899]
  We explore uncertainty quantification in large language models (LLMs) We derive an information-theoretic metric that allows to reliably detect when only epistemic uncertainty is large. We conduct a series of experiments which demonstrate the advantage of our formulation.
  arXiv  Detail & Related papers  (2024-06-04T17:58:18Z)
• Enhanced Entanglement in the Measurement-Altered Quantum Ising Chain [46.99825956909532]
  Local quantum measurements do not simply disentangle degrees of freedom, but may actually strengthen the entanglement in the system. This paper explores how a finite density of local measurement modifies a given state's entanglement structure.
  arXiv  Detail & Related papers  (2023-10-04T09:51:00Z)
• Full counting statistics as probe of measurement-induced transitions in the quantum Ising chain [62.997667081978825]
  We show that local projective measurements induce a modification of the out-of-equilibrium probability distribution function of the local magnetization. In particular we describe how the probability distribution of the former shows different behaviour in the area-law and volume-law regimes.
  arXiv  Detail & Related papers  (2022-12-19T12:34:37Z)
• Self-testing nonlocality without entanglement [0.0]
  We show that a measurement exhibiting nonlocality without entanglement can be certified in a device-independent manner. This result also demonstrates that genuine network quantum nonlocality can be obtained using only non-entangled measurements.
  arXiv  Detail & Related papers  (2022-03-24T16:45:41Z)
• Entanglement detection in quantum many-body systems using entropic uncertainty relations [0.0]
  We study experimentally accessible lower bounds on entanglement measures based on entropic uncertainty relations. We derive an improved entanglement bound for bipartite systems, which requires measuring joint probability distributions in only two different measurement settings per subsystem.
  arXiv  Detail & Related papers  (2021-01-21T20:50:11Z)
• Quantum Zeno effect with partial measurement and noisy dynamics [64.41511459132334]
  We study the Quantum Zeno Effect (QZE) induced by continuous partial measurement in the presence of short-correlated noise in the system Hamiltonian. We find that, depending on the noise parameters, the quantum Zeno effect can be enhanced or suppressed by the noise in different regions of the parameter space.
  arXiv  Detail & Related papers  (2020-06-24T18:15:05Z)
• Quantum Zeno effect appears in stages [64.41511459132334]
  In the quantum Zeno effect, quantum measurements can block the coherent oscillation of a two level system by freezing its state to one of the measurement eigenstates. We show that the onset of the Zeno regime is marked by a $textitcascade of transitions$ in the system dynamics as the measurement strength is increased.
  arXiv  Detail & Related papers  (2020-03-23T18:17:36Z)
• 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)
• An optimal measurement strategy to beat the quantum uncertainty in correlated system [0.6091702876917281]
  Uncertainty principle undermines the precise measurement of incompatible observables. Entanglement, another unique feature of quantum physics, was found may help to reduce the quantum uncertainty.
  arXiv  Detail & Related papers  (2020-02-23T05:27:36Z)
• Joint Measurability, Einstein-Podolsky-Rosen Steering, and Bell Nonlocality [0.0]
  We show that any set of measurements not jointly measurable can be used for demonstrating quantum nonlocality. We also discuss the connection between Bell nonlocality and joint measurability, and give evidence that both notions are inequivalent.
  arXiv  Detail & Related papers  (2014-06-26T18:45:13Z)

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.