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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Bell-inequality violation with a triggered photon-pair source.

R J Young1, R M Stevenson, A J Hudson

  • 1Toshiba Research Europe Limited, 208 Cambridge Science Park, Cambridge CB4 0GZ, United Kingdom. aps@r-j-y.com

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

Quantum dots violating Bell's inequality for the first time without post-selection demonstrate their suitability for quantum communication. This advancement enhances fidelity using temporal gating for improved nonlocal quantum correlations.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Quantum Optics

Background:

  • Bell's inequality is a fundamental test for quantum mechanics, probing nonlocal correlations.
  • Entangled photon sources are crucial for quantum communication protocols.
  • Previous demonstrations often required post-selection, limiting practical applications.

Purpose of the Study:

  • To demonstrate the violation of Bell's inequality using a triggered quantum dot photon-pair source.
  • To achieve high fidelity entangled states without post-selection.
  • To highlight the potential of quantum dots for quantum communication.

Main Methods:

  • Utilizing a triggered quantum dot source for entangled photon pairs.
  • Implementing temporal gating to enhance photon collection fidelity.
  • Performing a direct measurement of the CHSH Bell inequality.

Main Results:

  • Achieved the first violation of Bell's inequality with a triggered quantum dot source without post-selection.
  • Increased fidelity to the Bell state above 90% through temporal gating.
  • Demonstrated a clear violation of the CHSH Bell inequality.

Conclusions:

  • Triggered quantum dot entangled photon sources are viable for experiments violating Bell's inequality.
  • The developed method enhances the suitability of quantum dots for quantum communication exploiting nonlocal correlations.
  • This work paves the way for practical quantum communication technologies based on solid-state sources.