Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography

Details Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography

2006-08-03

arxiv.org/abs/quant-ph/0608034v1

Physics

Quantum Physics

See also R. Garcia-Patron and N. Cerf, quant-ph/0608032

Scientific paper

10.1103/PhysRevLett.97.190502

We analyze the asymptotic security of the family of Gaussian modulated
Quantum Key Distribution protocols for Continuous Variables systems. We prove
that the Gaussian unitary attack is optimal for all the considered bounds on
the key rate when the first and second momenta of the canonical variables
involved are known by the honest parties.

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