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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Detection loophole in asymmetric bell experiments.

Nicolas Brunner1, Nicolas Gisin, Valerio Scarani

  • 1Group of Applied Physics, University of Geneva, CH-1211 Geneva 4, Switzerland. nicolas.brunner@physics.unige.ch

Physical Review Letters
|August 7, 2007
PubMed
Summary

Closing the quantum detection loophole is possible with asymmetric systems. A minimal 43% detection efficiency is sufficient for one particle in entangled atom-photon pairs when the other is always detected.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Fundamental Physics

Background:

  • The detection loophole is a major challenge in experimental quantum mechanics, hindering the verification of Bell's inequalities.
  • Asymmetric entangled systems, like atom-photon pairs, offer potential solutions but require careful analysis of detection efficiencies.

Purpose of the Study:

  • To investigate the feasibility of closing the detection loophole using asymmetric entangled systems.
  • To determine the minimum required detection efficiency for entangled particles in specific Bell inequalities.

Main Methods:

  • Theoretical analysis of the Bell inequality I3322 for asymmetric entangled atom-photon pairs.
  • Modeling the influence of noise on the system's performance.

Main Results:

  • A minimal detection efficiency of 43% is shown to be sufficient for one particle when the other is always detected.
  • The study quantifies the impact of noise on the loophole closure.

Conclusions:

  • The detection loophole can be closed in asymmetric systems with achievable detection efficiencies.
  • Experimental implementation of these findings is discussed, paving the way for robust quantum experiments.