Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Closing the Door on Quantum Nonlocality

Version 1 : Received: 11 September 2018 / Approved: 12 September 2018 / Online: 12 September 2018 (01:06:46 CEST)

A peer-reviewed article of this Preprint also exists.

Kupczynski, M. Closing the Door on Quantum Nonlocality. Entropy 2018, 20, 877. Kupczynski, M. Closing the Door on Quantum Nonlocality. Entropy 2018, 20, 877.


Bell type inequalities are proven using oversimplified probabilistic models and/or counterfactual definiteness (CFD). If setting-dependent variables describing measuring instruments are correctly introduced none of these inequalities may be proven. In spite of this a belief in a mysterious quantum nonlocality is not fading. Computer simulations of Bell tests allow studying different scenarios how the experimental data might have been created. They allow also to generate outcomes of various counterfactual experiments such as repeated or simultaneous measurements performed in different settings on the same ‘’ photon-pair” etc. They allow reinforcing or relaxing CFD- compliance and /or to study the impact of various “photon identification procedures” mimicking those used in real experiments. Using a specific setting- dependent identification procedure data samples consistent with quantum predictions may be generated. It reflects an active role of instruments during the measurement process. Each setting dependent data samples are consistent with specific setting –dependent probabilistic models which may not be deduced using non-contextual local realistic or stochastic hidden variables. In this paper we discuss the results of these simulations. Since the data samples are generated in a locally causal way, these simulations provide additional strong arguments for closing the door on quantum nonlocality


Bell-inequalities; quantum nonlocality; computer simulations of Bell tests; local causality; contextuality loophole; photon identification loophole


Physical Sciences, Quantum Science and Technology

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