A comparison of two nonclassical measures, entanglement potential and the negativity of the Wigner function

Jie Li*, Gang Li, Jun Min Wang, Shi Yao ZHU, Tian Cai Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Two measures of nonclassicality, the entanglement potential and the negativity of the Wigner distribution function defined by the volume of its negative domains, are compared based on an investigation of the nonclassicality for Fock states and Schrödinger cat states in a decoherence process. Both the entanglement potential and the total negative probability are reduced in the linear loss process and the partial negative distribution of the Wigner function is wiped out for large losses while the entanglement potential is always positive. We give a bound condition and find that, though not yet mathematically proven in general, the upper bound of 50% is the maximum allowed loss for the survival of the negative distribution of the Wigner function.

Original languageEnglish
Article number085504
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume43
Issue number8
DOIs
Publication statusPublished - 2010

Scopus Subject Areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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