Quantum random-number generator with non-demolition measurements: semi-device-independent implementation

Abstract:We propose and analyze a novel quantum random-number generator based on a tripartite quantum system in which two subsystems act as detectors. Within a quantum non-demolition measurement scheme, one detector is used to certify the presence of genuine quantum effects in the system's evolution, while the second generates random numbers from a distribution that can be optimized to maximize their entropy. Using one two-level system and two three-level systems, we generate random numbers from a nearly uniform three-outcome distribution, yielding close-to-maximal entropy and therefore near-optimal randomness generation. A key feature of the protocol is that randomness generation and certification occur simultaneously. Moreover, certification does not rely on spacelike separation between detectors, removing a major constraint of device-independent approaches. This property enables practical implementation and facilitates the miniaturization of the device, making the protocol a promising candidate for scalable quantum technologies.

arXiv:2607.27025 [quant-ph]

(or arXiv:2607.27025v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2607.27025 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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