Quantum

Harnessing dimensional leakage for continuous-variable randomness certification

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 09/11/2026, 05:13:24 UTC.

Briefings

A new arXiv preprint proposes using averaging over full input ensembles to mitigate quantum state leakage in semi-device-independent protocols. This approach allows for nonzero randomness certification using low-squeezing single-mode Gaussian states and homodyne detection, offering an experimentally accessible continuous-variable implementation that overcomes strict Hilbert-space dimension assumptions.

Key points

• The almost-qudit framework quantifies quantum state leakage beyond a target subspace, which previously compromised randomness certification for fixed inputs.
• Averaging over the full input ensemble mitigates this vulnerability, enabling nonzero randomness certification with low-squeezing single-mode Gaussian states via homodyne detection.

Context

Semi-device-independent quantum protocols often rely on strict Hilbert-space dimension assumptions that are difficult to satisfy in realistic implementations, particularly with infinite-dimensional optical fields. This finding addresses that specific technical constraint.

Limitations

The evidence is an arXiv preprint (arXiv:2611.08607v1) from November 2026, meaning the findings are preliminary and subject to further validation. The study focuses on continuous-variable protocols using homodyne detection and Gaussian states, with no specific experimental results or city locations provided in the source.

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