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Entanglement constrained by superselection rules.

Stephen D Bartlett1, H M Wiseman

  • 1Department of Physics, Macquarie University, Sydney, New South Wales 2109, Australia.

Physical Review Letters
|October 4, 2003
PubMed
Summary
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Restrictions on local operations limit bipartite entanglement. Generalized superselection rules quantify this constraint, showing entanglement vanishes in large ensembles for quantum information processing due to symmetric group rules.

Area of Science:

  • Quantum Information Science
  • Quantum Entanglement Studies
  • Theoretical Quantum Physics

Background:

  • Bipartite entanglement is a key quantum resource.
  • Local operations can restrict entanglement.
  • Superselection rules define constraints on quantum states.

Purpose of the Study:

  • Introduce generalized superselection rules.
  • Quantify entanglement under these rules.
  • Analyze entanglement in ensemble quantum information processing.

Main Methods:

  • Developed a generalized superselection rule framework.
  • Quantified constrained entanglement.
  • Investigated symmetric group superselection rules.

Main Results:

Related Experiment Videos

  • Generalized superselection rules restrict bipartite entanglement.
  • Ensemble quantum information processing is subject to symmetric group superselection.
  • Entanglement per element approaches zero in large ensembles of Bell states.

Conclusions:

  • Generalized superselection rules provide a framework for understanding entanglement limitations.
  • Symmetric group superselection rules significantly impact ensemble quantum information processing.
  • Entanglement is not scalable in such constrained ensemble systems.