Strong no-go theorem for Gaussian quantum bit commitment
Résumé
Unconditionally secure bit commitment is forbidden by quantum mechanics. We extend this no-go theorem to continuous-variable protocols where both players are restricted to use Gaussian states and operations, which is a reasonable assumption in current-state optical implementations. Our Gaussian no-go theorem also provides a natural counter-example to a conjecture that quantum mechanics can be rederived from the assumption that key distribution is allowed while bit commitment is forbidden in Nature.
Domaines
Physique Quantique [quant-ph]| Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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