Device-independent security of quantum cryptography against collective attacks

Details Device-independent security of quantum cryptography against collective attacks Device-independent security of quantum cryptography against collective attacks

2007-02-15

arxiv.org/abs/quant-ph/0702152v2

Phys. Rev. Lett. 98, 230501 (2007)

Physics

Quantum Physics

5 pages, 1 figure. v2: minor modifications

Scientific paper

10.1103/PhysRevLett.98.230501

We present the optimal collective attack on a Quantum Key Distribution (QKD) protocol in the "device-independent" security scenario, where no assumptions are made about the way the QKD 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.

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