Regarding the Maximal Qubit Violations of n-Locality in Star and Chain Networks

• URL: http://arxiv.org/abs/2212.06915v1
• Date: Tue, 13 Dec 2022 21:39:24 GMT
• Title: Regarding the Maximal Qubit Violations of n-Locality in Star and Chain Networks
• Authors: Brian Doolittle and Eric Chitambar
• Abstract summary: Nonlocal correlations of noisy quantum systems are important for both understanding nature and developing quantum technology. We consider the correlations of star and chain quantum networks where noisy entanglement sources are measured by nonsignaling parties.
• Score: 4.974890682815778
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The nonlocal correlations of noisy quantum systems are important for both understanding nature and developing quantum technology. We consider the correlations of star and chain quantum networks where noisy entanglement sources are measured by nonsignaling parties. When pairs of local dichotomic observables are considered on qubit systems, we derive maximal n-local violations that are larger and more robust to noise than the maximal n-local violations reported previously. To obtain these larger values, we consider observables overlooked in the previous studies. Thus, we gain new insights into self-testing measurements and entanglement sources in star and chain networks.

Related papers

• Correlation strengths in hybrid networks [0.0]
  We investigate the maximal correlation strength as the non-classical feature in a generic hybrid network. We derive the upper bounds of the maximal correlation strengths in the associated full-classical, full-quantum, and fully-no-signaling networks.
  arXiv  Detail & Related papers  (2025-01-24T12:30:08Z)
• Correlated Noise Estimation with Quantum Sensor Networks [18.51122677780099]
  We develop a theoretical framework to determine the limits of correlated (weak) noise estimation with quantum sensor networks. We identify a sensing protocol, reminiscent of a many-body echo sequence, that achieves the fundamental limits of measurement sensitivity for a broad class of problems.
  arXiv  Detail & Related papers  (2024-12-23T19:00:06Z)
• Network Nonlocality Without Entanglement Of All Sources [0.0]
  Entanglement and nonlocality are two important nonclassical features of quantum correlations. We have analyzed the relation between entanglement content of the sources and detectable non n-locality in two distinct network topologies.
  arXiv  Detail & Related papers  (2024-10-19T15:11:00Z)
• From angular coefficients to quantum observables: a phenomenological appraisal in di-boson systems [44.99833362998488]
  Motivated by the growing interest in accessing the spin structure of multi-boson processes, we study polarisation and spin-correlation coefficients in di-boson systems. We show that higher-order corrections of QCD and electroweak type, off-shell modelling, and realistic effects such as fiducial selections and neutrino reconstruction are unavoidable.
  arXiv  Detail & Related papers  (2024-09-25T08:30:54Z)
• Entanglement and operator correlation signatures of many-body quantum Zeno phases in inefficiently monitored noisy systems [49.1574468325115]
  The interplay between information-scrambling Hamiltonians and local continuous measurements hosts platforms for exotic measurement-induced phase transition. We identify a non-monotonic dependence on the local noise strength in both the averaged entanglement and operator correlations. The analysis of scaling with the system size in a finite length chain indicates that, at finite efficiency, this effect leads to distinct MiPTs for operator correlations and entanglement.
  arXiv  Detail & Related papers  (2024-07-16T13:42:38Z)
• Engineering Transport via Collisional Noise: a Toolbox for Biology Systems [44.99833362998488]
  We study a generalised XXZ model in the presence of collision noise, which allows to describe environments beyond the standard Markovian formulation. Results constitute an example of the essential building blocks for the understanding of quantum transport in noisy and warm disordered environments.
  arXiv  Detail & Related papers  (2023-11-15T12:55:28Z)
• Star network non-n-local correlations can resist consistency noises better [0.0]
  We find that star network quantum non-n-local correlations can resist better consistency noises than these in polygon and linear networks. Polygon and linear network non-n-local correlations can not meet the requirements.
  arXiv  Detail & Related papers  (2023-07-18T14:35:00Z)
• Robustness of non-locality in many-body open quantum systems [0.0]
  Non-locality consists in the existence of non-classical correlations between local measurements. We show that non-local correlations are present, can be detected and might be robust against noise in many-body open quantum systems.
  arXiv  Detail & Related papers  (2022-02-24T13:05:36Z)
• 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)
• Quantum local random networks and the statistical robustness of quantum scars [68.8204255655161]
  We investigate the emergence of quantum scars in a general ensemble of random Hamiltonians. We find a class of scars, that we call "statistical" We study the scaling of the number of statistical scars with system size.
  arXiv  Detail & Related papers  (2021-07-02T07:53:09Z)
• Quantum noise protects quantum classifiers against adversaries [120.08771960032033]
  Noise in quantum information processing is often viewed as a disruptive and difficult-to-avoid feature, especially in near-term quantum technologies. We show that by taking advantage of depolarisation noise in quantum circuits for classification, a robustness bound against adversaries can be derived. This is the first quantum protocol that can be used against the most general adversaries.
  arXiv  Detail & Related papers  (2020-03-20T17:56:14Z)

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.