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Extracting entanglement from identical particles.

N Killoran1, M Cramer1, M B Plenio1

  • 1Institut für Theoretische Physik, Albert-Einstein-Allee 11, Universität Ulm, D-89069 Ulm, Germany.

Physical Review Letters
|May 3, 2014
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Summary
This summary is machine-generated.

Entanglement in identical particles, even when condensed, can be extracted into independent modes for quantum information tasks. This reveals fundamental connections between entanglement, squeezing, and indistinguishability.

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Area of Science:

  • Quantum mechanics
  • Quantum information theory
  • Condensed matter physics

Background:

  • Identical particles and entanglement are core quantum mechanics concepts.
  • Standard entanglement measures fail for identical particles in single modes.
  • This limitation has historically reduced perceived value for quantum information tasks.

Purpose of the Study:

  • To demonstrate that entanglement in identical particles is a valuable resource.
  • To show entanglement can be extracted from identical particles for practical applications.
  • To resolve debates on the quantum resource capabilities of condensed identical particle systems.

Main Methods:

  • Formal analysis of entanglement in systems of identical particles.
  • Developing a method to extract entanglement into independent modes.
  • Establishing a one-to-one correspondence between mode entanglement and particle entanglement.

Main Results:

  • Any entanglement among identical particles, including symmetrization-induced entanglement, can be extracted into an entangled state of independent modes.
  • The entanglement of the mode system directly corresponds to the entanglement between inaccessible identical particles.
  • New insights into entanglement generation in passive optical networks.

Conclusions:

  • Systems of identical particles possess valuable, extractable entanglement for quantum information.
  • The study settles long-standing debates regarding the resource capabilities of such states, like spin-squeezed Bose-Einstein condensates.
  • Reveals fundamental links between entanglement, squeezing, and particle indistinguishability.