Experimental test of nonlocal causality

@article{Ringbauer2016ExperimentalTO,
  title={Experimental test of nonlocal causality},
  author={Martin Ringbauer and Christina Giarmatzi and Rafael Chaves and Fabio Costa and Andrew G. White and Alessandro Fedrizzi},
  journal={Science Advances},
  year={2016},
  volume={2}
}
Causation at a distance does not explain quantum correlations. Explaining observations in terms of causes and effects is central to empirical science. However, correlations between entangled quantum particles seem to defy such an explanation. This implies that some of the fundamental assumptions of causal explanations have to give way. We consider a relaxation of one of these assumptions, Bell’s local causality, by allowing outcome dependence: a direct causal influence between the outcomes of… 
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References

SHOWING 1-10 OF 96 REFERENCES

QUANTUM CAUSALITY

The quantum extension of causal analysis has shown a rich picture of the subsystem causal connections, where the usual intuitive approach is hampered more commonly. The direction of causal connection…

Information-theoretic implications of quantum causal structures.

A general algorithm for computing information-theoretic constraints on the correlations that can arise from a given causal structure, where it allows for quantum systems as well as classical random variables.

The lesson of causal discovery algorithms for quantum correlations: causal explanations of Bell-inequality violations require fine-tuning

The need for fine-tuning for most of the causal mechanisms that have been proposed to underlie Bell correlations, including superluminal causal influences, superdeterminism (that is, a denial of freedom of choice of settings), and retrocausal influences which do not introduce causal cycles are demonstrated.

Significant-Loophole-Free Test of Bell's Theorem with Entangled Photons.

A Bell test is reported that closes the most significant of loopholes that provide loopholes for a local realist explanation of quantum mechanics, using a well-optimized source of entangled photons, rapid setting generation, and highly efficient superconducting detectors.

Beyond Bell's theorem: correlation scenarios

This work considers scenarios which feature several sources, but no choice of measurement for the observers, and describes examples of (quantum) non-locality in some of these scenarios, while posing many open problems along the way.

Unifying framework for relaxations of the causal assumptions in Bell's theorem.

A conceptual and computational framework for treating quantum mechanical correlations, which employs the language of Bayesian networks to systematically construct alternative causal structures and bound the degree of relaxation using quantitative measures that originate from the mathematical theory of causality.

Measurements on the reality of the wavefunction

Quantum mechanics is an outstandingly successful description of nature, underpinning fields from biology through chemistry to physics. At its heart is the quantum wavefunction, the central tool for…

Beyond Bell’s Theorem II: Scenarios with Arbitrary Causal Structure

It is found that it is possible to talk about classical correlations, quantum correlations and other kinds of correlations on any directed acyclic graph, and this captures various extensions of Bell scenarios that have been considered in the literature.

Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres

The data imply statistically significant rejection of the local-realist null hypothesis and could be used for testing less-conventional theories, and for implementing device-independent quantum-secure communication and randomness certification.

ON THE EINSTEIN PODOLSKY ROSEN PARADOX*

THE paradox of Einstein, Podolsky and Rosen [1] was advanced as an argument that quantum mechanics could not be a complete theory but should be supplemented by additional variables. These additional…
...