Local Realism versus Quantum Nonlocality

Emilio Santos

Amitava Datta, Dipankar Home

Liberato De, Augusto Garuccio

Zeng‐Bing Chen, Yu-Ao Chen, Jian-Wei Pan

The usual entanglement swapping protocol can entangle two particles that never interact. Here we demonstrate an all-versus-nothing violation of local realism for a partial entanglement swapping process. A Clauser-Horne-Shimony-Holt-type inequality for two particles entangled by entanglement swapping is proposed for a practical experiment and can be violated quantum mechanically up to 4 beyond Cirel'son's bound 2sqr(2). Our result uncovers the intriguing nonlocal character of entanglement swapping and may lead to a conclusive (loophole-free) test of local realism versus quantum mechanics. The experimental test of the nonlocality under current technology is also discussed.

Ming-Guang Hu, Dong-Ling Deng, Jing‐Ling Chen

We investigate the nonlocal property of the fractional statistics in Kitaev's toric code model. To this end, we construct the Greenberger-Horne-Zeilinger paradox which builds a direct conflict between the statistics and local realism. It turns out that the fractional statistics in the model is purely a quantum effect and independent of any classical theory. We also discuss a feasible experimental scheme using anyonic interferometry to test this contradiction.