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Researchers have demonstrated that device-independent quantum security protocols remain robust even with significant noise, such as 83% in input signals, challenging previous assumptions about the need for perfect communication. By mapping new Bell inequalities and reducing communication overhead to just two bits, this work enables more practical cryptographic implementations without requiring perfectly isolated devices. These advancements directly address long-standing limitations in certifying quantum nonlocality, offering a more resilient foundation for real-world quantum cryptography.

Surse care acoperăQuantum Zeitgeist, LessWrong

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Quantum Security Holds Firm Even with Imperfect Data Transmission

Quantum Zeitgeist23 mai 20265 min de cititArticolul și perspectiva sunt în engleză.

A violation of Bell inequalities, persisting even with 83% noise on input signals, challenges established limits in quantum cryptography. Until now, device-independent security protocols demanded perfect communication between parties, an unrealistic expectation in confined experimental setups. This work demonstrates that such protocols can remain secure despite imperfections, opening new avenues for practical implementation and the discovery of further inequalities.

Kuntal Sengupta and Lewis Wooltorton, researchers at the CNRS, have demonstrated that quantum correlations persist even when binary inputs are transmitted with noise between devices. Their work thoroughly maps the boundaries of classically-allowed behaviours under these noisy conditions, revealing new Bell inequalities that can certify non-signalling quantum correlations. These inequalities offer a key advantage over existing methods when verifying device-independent randomness, proving more resilient to noise and enabling more secure cryptographic protocols in practical settings. Two bits of communication are now sufficient to reproduce all quantum correlations generated by projective measurements on arbitrary two-qudit states, representing a sharp reduction from previous…

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