Characterization of collective Gaussian attacks and security of coherent-state quantum cryptography.
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.
Pirandola
Stefano
S
Research Laboratory of Electronics, MIT, Cambridge, Massachusetts 02139, USA.
Braunstein
Samuel L
SL
Lloyd
Seth
S