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Detecting nonclassical system-environment correlations by local operations.

Manuel Gessner1, Heinz-Peter Breuer

  • 1Physikalisches Institut, Universität Freiburg, Hermann-Herder-Strasse 3, D-79104 Freiburg, Germany. manuel.gessner@physik.uni-freiburg.de

Physical Review Letters
|November 24, 2011
PubMed
Summary
This summary is machine-generated.

We present a new method to detect nonclassical correlations in open quantum systems. This approach uses a dephasing map to create a witness for quantum correlations, applicable to complex systems.

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Area of Science:

  • Quantum Physics
  • Quantum Information Science

Background:

  • Understanding system-environment interactions is crucial in quantum mechanics.
  • Nonclassical correlations in initial states of open quantum systems are key to quantum information processing.

Purpose of the Study:

  • To develop a general strategy for detecting nonclassical system-environment correlations.
  • To provide an experimentally accessible method for quantifying these correlations.

Main Methods:

  • A dephasing map is applied locally to the open quantum system.
  • A witness is constructed using the Hilbert-Schmidt distance between system states.
  • Expectation values are derived for random matrix ensembles.

Main Results:

  • The method provides an experimentally accessible witness for genuine quantum correlations.
  • The witness's expectation value is proportional to quantum discord.
  • For pure initial states, the witness reduces to concurrence.

Conclusions:

  • The developed strategy offers a robust way to identify nonclassical correlations in open quantum systems.
  • This work connects system-environment correlations to established quantum information measures like quantum discord and concurrence.