Exploring the boundary of quantum correlations with a time-domain optical processor

• URL: http://arxiv.org/abs/2208.07794v2
• Date: Fri, 19 Jan 2024 10:40:19 GMT
• Title: Exploring the boundary of quantum correlations with a time-domain optical processor
• Authors: Zheng-Hao Liu, Yu Meng, Yu-Ze Wu, Ze-Yan Hao, Zhen-Peng Xu, Cheng-Jun Ai, Hai Wei, Kai Wen, Jing-Ling Chen, Jie Ma, Jin-Shi Xu, Chuan-Feng Li, and Guang-Can Guo
• Abstract summary: We propose and observe a strong form of contextuality in high Hilbert-space dimensions. Our results pave the way for the exploration of exotic quantum correlations with time-multiplexed optical systems.
• Score: 16.003717185276052
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Contextuality is a hallmark feature of the quantum theory that captures its incompatibility with any noncontextual hidden-variable model. The Greenberger--Horne--Zeilinger (GHZ)-type paradoxes are proofs of contextuality that reveal this incompatibility with deterministic logical arguments. However, the simplest GHZ-type paradox with the fewest number of complete contexts and the largest amount of nonclassicality remains elusive. Here, we derive a GHZ-type paradox utilizing only three complete contexts and show this number saturates the lower bound posed by quantum theory. We demonstrate the paradox with a time-domain fiber optical platform and recover all essential ingredients in a 37-dimensional contextuality test based on high-speed modulation, convolution, and homodyne detection of time-multiplexed pulsed coherent light. By proposing and observing a strong form of contextuality in high Hilbert-space dimensions, our results pave the way for the exploration of exotic quantum correlations with time-multiplexed optical systems.

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