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This research identifies a fundamental vulnerability in device-independent cryptographic protocols, revealing that attempts to extend quantum correlations under relativistic constraints inevitably introduce hidden superluminal signaling. The study establishes a strict boundary for maintaining consistency between quantum mechanics and relativity, proving that only conventional quantum correlations remain logically sound without compromising causality. These findings necessitate updated security frameworks for bit commitment and secret sharing that explicitly account for spacetime labels alongside standard input-output statistics.

Sursă care acoperăQuantum Zeitgeist

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Jamming Quantum States Shows Hidden Signals at Superluminal Speeds

Quantum Zeitgeist3 septembrie 20266 min de cititArticolul și perspectiva sunt în engleză.

Device-independent cryptography previously assumed resilience against adversaries obeying standard no-signaling principles. However, extending quantum correlations through permitted ‘jamming’ unexpectedly reveals hidden superluminal signaling possibilities. These findings demonstrate explicit vulnerabilities in established bit commitment and secret sharing protocols under realistic relativistic conditions.

Investigations into relativistic causality within certain spacetime arrangements allowing ‘jamming’, superluminal causal influences that nevertheless preclude faster-than-light communication, have been completed by researchers. A full characterisation of correlations aligning with relativistic causality is presented via expansion of a previously released operator framework detailed in PRL 104. By demanding a quantum underpinning for the system, proofs demonstrate that all non-trivial jamming, irrespective of its reliance on states, invariably leads to concealed superluminal signalling. Therefore, solely conventional quantum correlations remain logically sound. Extending quantum correlations is permitted by relativistic causality only up to a point; previously, it considered theoretically possible while avoiding signals travelling faster than light. Detailed in Physical Review Letters…

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