Article Synopsis
- Contextuality is a key feature of quantum theory that contrasts with noncontextual hidden-variable models, with GHZ-type paradoxes providing clear proof of this difference.
- The researchers present a new GHZ-type paradox that achieves the minimum context-cover number of 3, proving its relevance in quantum mechanics.
- They demonstrate their findings through advanced optical techniques in a 37-dimensional setup, opening pathways for further investigation into unique quantum correlations using time-multiplexed systems.
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Article 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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11789840 | PMC |
| http://dx.doi.org/10.1126/sciadv.abd8080 | DOI Listing |
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