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

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 GHZ-type paradox whose events can be included in the fewest contexts and that brings the strongest nonclassicality remains elusive. Here, we derive a GHZ-type paradox with a context-cover number of 3 and show that this number saturates the lower bound posed by quantum theory. We demonstrate the paradox with a time-domain fiber optical platform and recover the quantum prediction in a 37-dimensional setup based on high-speed modulation, convolution, and homodyne detection of time-multiplexed pulsed coherent light. By proposing and studying a strong form of contextuality in high-dimensional Hilbert space, our results pave the way for the exploration of exotic quantum correlations with time-multiplexed optical systems.

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Publication Details

Journal
Science Advances
Published
2025-01-29
DOI
https://doi.org/10.1126/sciadv.abd8080
Citations
2
Primary Topic
Quantum Information and Cryptography
Type
article
Field-Weighted Citation Impact
4.96

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article

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

Zhen‐Peng Xu, Yu-Ze Wu, Jin‐Shi Xu, Chuan‐Feng Li et al.
2 citations
Science Advances
Quantum Information and Cryptography
4.96
article

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

Zhen‐Peng Xu, Yu-Ze Wu, Jin‐Shi Xu, Chuan‐Feng Li, Guang‐Can Guo, Zhenghao Liu, Cheng-Jun Ai, Kai Wen, Yu Meng, Jing‐Ling Chen, Ze-Yan Hao, Jie Ma, Hai Wei
article en
2 citations

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 GHZ-type paradox whose events can be included in the fewest contexts and that brings the strongest nonclassicality remains elusive. Here, we derive a GHZ-type paradox with a context-cover number of 3 and show that this number saturates the lower bound posed by quantum theory. We demonstrate the paradox with a time-domain fiber optical platform and recover the quantum prediction in a 37-dimensional setup based on high-speed modulation, convolution, and homodyne detection of time-multiplexed pulsed coherent light. By proposing and studying a strong form of contextuality in high-dimensional Hilbert space, our results pave the way for the exploration of exotic quantum correlations with time-multiplexed optical systems.

Science AdvancesVol. 11(5)
University of Science and Technology of China (CN), Anhui University (CN), Nankai University (CN), University of Siegen (DE), Folkwang University of the Arts (DE), Beijing Academy of Quantum Information Sciences (CN), Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (CN)
National Natural Science Foundation of China
Openalex Percentile: Top 6%
Quantum Information and Cryptography
4.96
DOIOpen Access PDFOpenAlex
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