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Uncovering Quantum Correlations with Time-Multiplexed Click Detection.

J Sperling1, M Bohmann1, W Vogel1

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

Physical Review Letters
|July 25, 2015
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Summary
This summary is machine-generated.

We developed a time-multiplexed click detection scheme to reveal quantum correlations in multimode light fields. This robust method accurately characterizes quantum-correlated photons for quantum communications, even with experimental imperfections.

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Area of Science:

  • Quantum Optics
  • Quantum Information Science

Background:

  • Probing quantum correlations in multimode light fields is crucial for quantum information science.
  • Traditional methods often rely on low-intensity approximations, limiting their applicability.
  • Characterizing nonclassical correlations in complex optical systems remains challenging.

Purpose of the Study:

  • To implement and demonstrate a time-multiplexed click detection scheme for probing quantum correlations.
  • To show that this scheme can reveal nonclassical correlations in multimode light fields, even when individual modes appear classical.
  • To provide a robust method for characterizing quantum-correlated light fields for practical applications.

Main Methods:

  • Utilizing a time-multiplexed click detection setup.
  • Employing the theory of click counting for analyzing correlated photon pairs generated via parametric down-conversion.
  • Analyzing second- and higher-order moments directly from measured click statistics.
  • Operating with relatively high mean photon numbers and accounting for experimental imperfections.

Main Results:

  • Demonstrated the uncovering of nonclassical correlations in multimode light fields.
  • Showed that click counting is effective for measuring the nonclassical character of photon pairs, bypassing low-intensity approximations.
  • Achieved high significance in demonstrating effects without data postprocessing, despite low efficiencies.

Conclusions:

  • The time-multiplexed click detection scheme is a reliable and robust method for characterizing quantum-correlated light fields.
  • This approach is suitable for practical applications in quantum communications.
  • The method effectively reveals nonclassical correlations even when single-mode reductions are classical.