Testing a continuous-variable Bell-like inequality with a hybrid-encoded system

• URL: http://arxiv.org/abs/2604.25901v1
• Date: Tue, 28 Apr 2026 17:44:42 GMT
• Title: Testing a continuous-variable Bell-like inequality with a hybrid-encoded system
• Abstract summary: Continuous-variable quantum systems are promising candidates for quantum computing and quantum information processing.<n>We map the spatial modes of a single photon, deterministically generated from an InAs/GaAs quantum emitter, to the logical operations in the Gottesman--Kitaev--Preskill code space.<n>We observe a violation of the Bell-like noncontextual hidden-variable inequality by 380 standard deviations.
• Score: 11.376220165071603
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Continuous-variable quantum systems are promising candidates for quantum computing and quantum information processing. It is widely known that quadrature measurements on Gaussian continuous-variable systems can be described by a noncontextual hidden-variable model and cannot violate a Bell inequality. Here, we demonstrate that the observation fails when sequential measurements are involved. Our experiment is realized by mapping the spatial modes of a single photon, deterministically generated from an InAs/GaAs quantum emitter, to the logical operations in the Gottesman--Kitaev--Preskill code space. Employing a black-box-style approach, we observe a violation of the Bell-like noncontextual hidden-variable inequality by 380 standard deviations. Our results address the conceptual loopholes in previous works and open up new possibilities for studying fundamental quantum physics using photonic-encoded continuous-variable systems.

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