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Computable measure of nonclassicality for light.

János K Asbóth1, John Calsamiglia, Helmut Ritsch

  • 1Institute of Theoretical Physics, University of Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.

Physical Review Letters
|May 21, 2005
PubMed
Summary

We introduce the entanglement potential (EP) to quantify nonclassicality in quantum states. This new measure efficiently detects nonclassicality and has a clear physical meaning, distinguishing it from prior methods.

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Area of Science:

  • Quantum optics
  • Quantum information theory

Background:

  • Nonclassicality is a key feature of quantum states.
  • Existing measures of nonclassicality can be difficult to compute or lack clear physical interpretations.

Purpose of the Study:

  • To propose a new, efficient, and physically interpretable measure of nonclassicality for single-mode quantum states.
  • To introduce the entanglement potential (EP) as a robust nonclassicality quantifier.

Main Methods:

  • Defining the entanglement potential (EP) based on generating two-mode entanglement from a single-mode field.
  • Utilizing linear optics, auxiliary classical states, and ideal photodetectors in the theoretical framework.
  • Deriving closed-form expressions for the EP for specific quantum states.

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Main Results:

  • The entanglement potential (EP) is shown to be an effective detector of nonclassicality.
  • EP possesses a direct physical interpretation related to generated entanglement.
  • Efficient computation of EP is demonstrated, surpassing limitations of previous measures.
  • Closed expressions for EP were derived for significant quantum state classes.

Conclusions:

  • The entanglement potential (EP) offers a superior method for quantifying nonclassicality in quantum states.
  • Its efficiency, interpretability, and computational tractability make it a valuable tool in quantum optics and information.
  • The study also analyzed the degradation of nonclassicality in lossy channels using the EP framework.