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Bound nonlocality and activation.

Nicolas Brunner1, Daniel Cavalcanti, Alejo Salles

  • 1H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom.

Physical Review Letters
|March 17, 2011
PubMed
Summary
This summary is machine-generated.

Nonlocality distillation reveals irreversibility, termed "bound nonlocality," where distillable nonlocality is less than nonlocal cost. This study shows nonlocal distillability can be activated.

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Area of Science:

  • Quantum Information Science
  • Quantum Foundations

Background:

  • Nonlocality is a key feature of quantum mechanics, enabling tasks beyond classical capabilities.
  • Quantifying and manipulating nonlocality are crucial for quantum information processing.

Purpose of the Study:

  • To investigate nonlocality distillation using measures based on the Elitzur-Popescu-Rohrlich decomposition.
  • To define and analyze the nonlocal cost and distillable nonlocality for quantum systems.

Main Methods:

  • Utilizing the Elitzur-Popescu-Rohrlich decomposition to define measures of nonlocality.
  • Analyzing the relationship between nonlocal cost and distillable nonlocality for multiple copies of nonlocal boxes.

Main Results:

  • Identified quantum boxes where distillable nonlocality is strictly less than their nonlocal cost.
  • Demonstrated a form of irreversibility in nonlocality, termed 'bound nonlocality'.
  • Showed that nonlocal distillability can be activated under certain conditions.

Conclusions:

  • Nonlocality exhibits irreversibility, similar to thermodynamic concepts like entropy.
  • The findings have implications for understanding the fundamental nature of quantum nonlocality and its potential applications.