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Distilling Nonlocality in Quantum Correlations.

Sahil Gopalkrishna Naik1, Govind Lal Sidhardh1, Samrat Sen1

  • 1Department of Physics of Complex Systems, S.N. Bose National Center for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700106, India.

Physical Review Letters
|June 16, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel wiring protocol to amplify quantum nonlocality from weak correlations. The method effectively distills nonlocality, even from systems close to classical limits, and aids in detecting post-quantum correlations.

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Area of Science:

  • Quantum Information Science
  • Foundations of Quantum Mechanics

Background:

  • Bell's theorem establishes nonlocality as a key feature of quantum correlations.
  • Device-independent protocols leverage nonlocality for tasks like secure key distribution.
  • Existing methods require strong nonlocal correlations, limiting practical applications.

Purpose of the Study:

  • To investigate the distillation of quantum nonlocality from weakly correlated quantum systems.
  • To develop a protocol for amplifying nonlocal correlations using free operations (wirings).
  • To assess the protocol's effectiveness in various quantum correlation scenarios and its potential for detecting post-quantum correlations.

Main Methods:

  • Utilizing a logical OR-AND wiring protocol in the simplest Bell scenario.
  • Applying free operations on multiple copies of weakly nonlocal quantum systems.
  • Analyzing the distillation of quantum correlations in an eight-dimensional correlation space.

Main Results:

  • Demonstrated a protocol that distills quantum nonlocality from arbitrarily weak correlations.
  • Showcased that distillable quantum correlations occupy a non-zero measure in the correlation space.
  • Preserved the structure of quantum Hardy correlations during distillation.
  • Successfully distilled correlations close to local deterministic points.
  • Validated the protocol's efficacy in detecting post-quantum correlations.

Conclusions:

  • Quantum nonlocality can be distilled from weak correlations using the proposed wiring protocol.
  • The protocol offers a significant advancement for device-independent quantum information processing.
  • This work expands the understanding of quantum correlations and their manipulation.