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26 April 2024

» arxiv » 1902.8473

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Measurements of nonlocal variables and demonstration of the failure of the product rule for a pre- and postselected pair of photons
Xiao-Ye Xu ; Wei-Wei Pan ; Qin-Qin Wang ; Jan Dziewior ; Lukas Knips ; Yaron Kedem ; Kai Sun ; Jin-Shi Xu ; Yong-Jian Han ; Chuan-Feng Li ; Guang-Can Guo ; Lev Vaidman ;
Date:	22 Feb 2019
Abstract:	We report the first implementation of the von Neumann instantaneous measurements of nonlocal variables which becomes possible due to technological achievements in creating hyperentangled photons. Tests of reliability and of the nondemolition property of the measurements have been performed with high precision showing the suitability of the scheme as a basic ingredient of numerous quantum information protocols. The method allows to demonstrate for the first time with strong measurements a special feature of pre- and postselected quantum systems: the failure of the product rule. It has been verified experimentally that for a particular pre- and postselected pair of particles a single measurement on particle $A$ yields with certainty $sigma_x^A=-1$, a single measurement on particle $B$ yields with certainty $sigma_y^B=-1$, and a single nonlocal measurement on particles $A$ and $B$ yields with certainty $sigma_x^A sigma_y^B=-1$.
Source:	arXiv, 1902.8473
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