# Loopholes in Bell inequality tests of local realism

@article{Larsson2014LoopholesIB, title={Loopholes in Bell inequality tests of local realism}, author={Jan-{\AA}ke Larsson}, journal={Journal of Physics A}, year={2014}, volume={47}, pages={424003} }

Bell inequalities are intended to show that local realist theories cannot describe the world. A local realist theory is one where physical properties are defined prior to and independent of measurement, and no physical influence can propagate faster than the speed of light. Quantum-mechanical predictions for certain experiments violate the Bell inequality while a local realist theory cannot, and this shows that a local realist theory cannot give those quantum-mechanical predictions. However…

## 163 Citations

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## References

SHOWING 1-10 OF 99 REFERENCES

Experimental violation of a Bell's inequality with efficient detection

- PhysicsNature
- 2001

Here, correlations in the classical properties of massive entangled particles (9Be+ ions): these correlations violate a form of Bell's inequality, and the high detection efficiency of the apparatus eliminates the so-called ‘detection’ loophole.

Violation of local realism with freedom of choice

- PhysicsProceedings of the National Academy of Sciences
- 2010

This paper presents an experiment that violates Bell’s inequality while simultaneously closing the locality loophole and addressing the freedom-of-choice loophole, also closing the latter within a reasonable set of assumptions.

Appendix to "Accardi contra Bell (cum mundi) : The Impossible Coupling"

- Computer Science
- 2001

It is shown that the randomised design of the Aspect experiment closes a loophole for local realism, and a supermartingale version of the classical Bernstein (1924) inequality guaranteeing a not-heavier-than-Gaussian tail of the distribution of a sum of bounded superMartingale differences.

Bell violation using entangled photons without the fair-sampling assumption

- PhysicsNature
- 2013

This experiment makes the photon the first physical system for which each of the main loopholes has been closed, albeit in different experiments, and uses the Eberhard form of Bell’s inequality, which allows a lower collection efficiency than other forms.

Bell-inequality violation with entangled photons, free of the coincidence-time loophole

- Physics
- 2014

In a local realist model, physical properties are defined prior to and independent of measurement and no physical influence can propagate faster than the speed of light. Proper experimental violation…

Bell’s inequality and detector inefficiency

- Physics
- 1998

In this thesis, the question "What kind of models can be used to describe microcosmos?" will be discussed. Being difficult and very large in scope, the question has here been restricted to whether or…

Quantum nonlocality, Bell inequalities, and the memory loophole

- Physics
- 2002

In the analysis of experiments designed to reveal violation of Bell-type inequalities, it is usually assumed that any hidden variables associated with the nth particle pair would be independent of…

Proposed experiment to test the nonseparability of quantum mechanics

- Physics
- 1976

As a criterion between quantum mechanics and local hidden-variable theories, the so-called Einstein--Podolsky--Rosen paradox is mainly tested in the form of the statistical correlation between…

Violation of Bell's inequality in Josephson phase qubits

- PhysicsNature
- 2009

This experiment uses a pair of Josephson phase qubits acting as spin-1/2 particles, and shows that the qubits can be entangled and measured so as to violate the Clauser–Horne–Shimony–Holt (CHSH) version of the Bell inequality.