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Closing the detection loophole in Bell experiments using qudits.

Tamás Vértesi1, Stefano Pironio, Nicolas Brunner

  • 1Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, P.O. Box 51, Hungary.

Physical Review Letters
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

Quantum systems larger than two dimensions lower detection efficiency needs for Bell tests. New asymmetric and symmetric tests allow for lower efficiencies, making experiments more feasible with advancements in entanglement.

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Area of Science:

  • Quantum Information Science
  • Quantum Foundations

Background:

  • Closing loopholes in Bell tests is crucial for verifying quantum mechanics.
  • Existing Bell tests often require high detection efficiencies, posing experimental challenges.

Purpose of the Study:

  • To investigate methods for reducing the stringent detection efficiency requirements in Bell tests.
  • To introduce novel Bell test schemes utilizing higher-dimensional quantum systems.

Main Methods:

  • Developing asymmetric Bell tests tolerant to efficiencies near 1/N for N-dimensional systems.
  • Proposing a symmetric Bell test for four-dimensional systems with a reduced efficiency threshold of 61.8%.

Main Results:

  • Demonstrated that increasing quantum system dimensionality significantly lowers required detection efficiencies.
  • Introduced specific Bell test protocols tailored for higher dimensions.

Conclusions:

  • Higher-dimensional quantum systems offer a practical pathway to close the detection loophole in Bell tests.
  • The proposed schemes are experimentally viable due to recent advances in atom-photon and hyperentanglement experiments.