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Quantum Correlations from the Conditional Statistics of Incomplete Data.

J Sperling1,2, T J Bartley2,3, G Donati2

  • 1Arbeitsgruppe Theoretische Quantenoptik, Institut für Physik, Universität Rostock, D-18051 Rostock, Germany.

Physical Review Letters
|September 3, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces new criteria to detect quantum correlations in light fields using click-counting detectors. It demonstrates nonclassical correlations in parametric down-conversion and verifies quantum correlations in single-photon states.

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Area of Science:

  • Quantum Optics
  • Quantum Information Science

Background:

  • Click-counting detectors provide incomplete photon statistics.
  • Characterizing quantum correlations with limited detector information is challenging.

Purpose of the Study:

  • To establish criteria for detecting conditional quantum correlations in light fields.
  • To demonstrate and verify nonclassical and quantum correlations using joint and conditional statistics.
  • To develop methods robust against detector imperfections.

Main Methods:

  • Theoretical formulation of a correlation parameter for conditional statistics.
  • Derivation of nonclassicality criteria based on joint and conditional click statistics.
  • Experimental verification using parametric down-conversion and heralded single-photon states.

Main Results:

  • Established a correlation parameter and nonclassicality criteria for conditional statistics.
  • Demonstrated nonclassical correlations in parametric down-conversion light.
  • Verified quantum correlations in heralded single-photon states.
  • Results are independent of photodetector response functions, quantum efficiency, and dark-count rates.

Conclusions:

  • The developed criteria effectively detect conditional quantum correlations.
  • The methods provide a robust approach to characterizing quantum light fields.
  • This work advances the understanding of quantum correlations with realistic measurement devices.