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Researchers have successfully certified quantum random number generation from semiconductor spin noise at speeds exceeding 3 Gbit/s, a significant leap over previous methods that required detailed knowledge of the source's internal dynamics. This semi-device-independent approach allows for robust security certification even when the optical source is untrusted, provided the receiver is calibrated and energy contributions from the emitter are accounted for. While these high rates represent a major theoretical and experimental advance, practical integration into existing cryptographic systems remains to be demonstrated under real-world conditions.
Researchers Certify High-Speed Randomness from Semiconductor Noise
Can randomness be reliably extracted from semiconductor noise without fully understanding its source? Now it can: new measurements certify quantum random number generation at rates exceeding 3 Gbit/s from indium gallium arsenide, more than two orders of magnitude faster than previous methods. Unlike prior approaches, this certification works even with measurable energy contributions directly from the emitting material itself.
A new method certifies quantum randomness generated from semiconductor spin noise without detailed modelling of its underlying dynamics. Semi-device-independent quantum randomness certification has been achieved with this approach, establishing the first such certificate for any spin-noise source. The untrusted optical source was limited by an experimentally verified mean-photon-number bound alongside a stated analogue range and per-sample clipping limit. A calibrated, noisy, coarse-grained homodyne measurement characterised the trusted receiver using a semidefinite model. Certified randomness rates exceeding 3.4 Gbit/s have been achieved using semiconductor materials, representing an improvement of over two orders of magnitude compared with previous spin-noise generators which typically operated…
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