From Bell's Theorem to Secure Quantum Key Distribution

Abstract

Any Quantum Key Distribution (QKD) protocol consists first of sequences of measurements that produce some correlation between classical data. We show that these correlation data must violate some Bell inequality in order to contain distillable secrecy, if not they could be produced by quantum measurements performed on a separable state of larger dimension. We introduce a new QKD protocol and prove its security against any individual attack by an adversary only limited by the no-signaling condition.

5 pages, 2 figures, REVTEX4

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• Lower and upper bounds on the secret key rate for QKD protocols using one--way classical communication
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