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Device-Independent Security of Quantum Cryptography against Collective Attacks

2007; American Physical Society; Volume: 98; Issue: 23 Linguagem: Inglês

10.1103/physrevlett.98.230501

1092-0145

Antonio Acín, Nicolas Brunner, Nicolas Gisin, Serge Massar, Stefano Pironio, Valerio Scarani,

Quantum Computing Algorithms and Architecture

We present the optimal collective attack on a quantum key distribution protocol in the "device-independent" security scenario, where no assumptions are made about the way the quantum key distribution devices work or on what quantum system they operate. Our main result is a tight bound on the Holevo information between one of the authorized parties and the eavesdropper, as a function of the amount of violation of a Bell-type inequality.