Characterization of Collective Gaussian Attacks and Security of Coherent-State Quantum Cryptography

Stefano Pirandola, Samuel L. Braunstein, Seth Lloyd

Published 2008-06-25, updated 2008-12-02Version 2

We provide a simple description of the most general collective Gaussian attack in continuous-variable quantum cryptography. In the scenario of such general attacks, we analyze the asymptotic secret-key rates which are achievable with coherent states, joint measurements of the quadratures and one-way classical communication.