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Purification of a single-photon nonlinearity.

H Snijders1, J A Frey2, J Norman3

  • 1Huygens-Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands.

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|August 31, 2016
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Summary

Researchers restored high fidelity in quantum information processing using semiconductor quantum dots. Polarization techniques purified photon streams, achieving record correlations for quantum computing applications.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Nanophotonics

Background:

  • Semiconductor quantum dots in optical microcavities are key for integrated quantum information processing.
  • Finite quantum dot lifetime and coupling issues currently limit fidelity in these systems.

Purpose of the Study:

  • To investigate methods for restoring high fidelity in quantum dot-based optical systems.
  • To enhance the generation of strongly correlated photons for quantum information applications.

Main Methods:

  • Utilized a nearly polarization degenerate microcavity in the weak coupling regime.
  • Implemented polarization pre- and postselection techniques.
  • Analyzed the interference of orthogonally polarized transmission amplitudes.

Main Results:

  • Achieved high fidelity by canceling un-interacted light through controlled polarization interference.
  • Transformed coherent light into a stream of strongly correlated photons with a second-order correlation value up to 40.
  • Demonstrated correlations exceeding previous experimental results, even in the strong-coupling regime.

Conclusions:

  • Polarization pre- and postselection effectively restores high fidelity in quantum dot microcavities.
  • This purification technique significantly enhances photon correlation, surpassing prior experimental limits.
  • The method shows promise for improving fidelity in quantum dot-based logic gates for quantum computing.