Semi-device-independent quantum randomness certification in semiconductor spin-noise measurements

• URL: http://arxiv.org/abs/2609.10037v1
• Date: Wed, 09 Sep 2026 11:09:32 GMT
• Title: Semi-device-independent quantum randomness certification in semiconductor spin-noise measurements
• Abstract summary: Complex solid-state systems are promising platforms for scalable, high-bandwidth quantum random-number generation.<n>We certify randomness that remains private against an adversary holding arbitrary quantum side information.<n>This exceeds the certified entropy rate of earlier spin-noise generators by more than two orders of magnitude.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Complex solid-state systems are promising platforms for scalable, high-bandwidth quantum random-number generation, yet certifying the quantum origin of their fluctuations remains difficult because the underlying microscopic dynamics are hard to model and validate. Here we demonstrate semi-device-independent quantum randomness certification from semiconductor spin noise, to our knowledge the first such certificate on any spin-noise source, without relying on a microscopic model of the spin system. The untrusted optical source is constrained by an experimentally tested mean-photon-number bound together with a declared analogue-range and per-sample clipping ceiling, while the trusted receiver is described as a calibrated, noisy, coarse-grained homodyne measurement. Using a semidefinite programme with rigorously controlled Fock-space truncation, we certify randomness that remains private against an adversary holding arbitrary quantum side information. Offline analysis yields certified entropy rates of $3.2$--$3.4$\,Gbit/s from a singly charged (In,Ga)As quantum-dot ensemble and $33$\,Mbit/s from $n$-GaAs in a spin-noise-matched detection mode. This exceeds the certified entropy rate of earlier spin-noise generators by more than two orders of magnitude, and the certificate tolerates a resolved per-symbol energy contribution from the solid-state emitter itself rather than requiring a near-vacuum input.

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