Device-Independent Security of Quantum Cryptography against Collective Attacks
Antonio Acín, Nicolas Brunner, Nicolas Gisin, Serge Massar, Stefano Pironio, Valerio Scarani · Physical Review Letters · 2007
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.