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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Published on: May 30, 2014

Quantum Nonlocality with Arbitrary Limited Detection Efficiency.

Gilles Pütz¹, Anthony Martin¹, Nicolas Gisin¹

¹Group of Applied Physics, University of Geneva, CH-1211 Geneva 4, Switzerland.

Physical Review Letters

|January 23, 2016

Summary

This summary is machine-generated.

This study demonstrates quantum nonlocality even with limited detection efficiency. By introducing a new assumption, researchers show that Bell-like inequalities can be violated, proving nonlocality is possible with low efficiencies.

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Area of Science:

Quantum Information Science
Foundations of Quantum Mechanics

Background:

Bell's theorem proves quantum nonlocality but relies on high detection efficiency.
Nondetection events due to detector inefficiencies create loopholes (e.g., the detection loophole).

Purpose of the Study:

To demonstrate quantum nonlocality under the assumption of limited, but not necessarily high, detection efficiency.
To analyze correlations satisfying limited detection locality and derive Bell-like inequalities.

Main Methods:

Introduced the concept of limited detection efficiency (lower bounded by η(min)>0).
Analyzed correlations under an adversarial scenario with partial control over inefficiencies.
Derived linear Bell-like inequalities satisfied by limited detection locality.

Main Results:

Quantum theory predicts the violation of derived inequalities for all η(min)>0.
Demonstrated nonlocality is achievable even with arbitrarily small limited detection efficiencies.
Experimentally validated the findings using a twin-photon setup with passive switches and low overall detection efficiency.

Conclusions:

Quantum nonlocality can be robustly demonstrated under realistic conditions of limited detection efficiency.
The study overcomes the detection loophole by relaxing the assumption of near-perfect detectors.
Experimental validation confirms the theoretical predictions, advancing the understanding of quantum foundations.