Security bound of continuous-variable quantum key distribution with noisy coherent states and channel

Abstract

Security of a continuous-variable quantum key distribution protocol based on noisy coherent states and channel is analyzed. Assuming the noise of coherent states is induced by Fred, a neutral party relative to others, we prove that the prepare and measurement scheme and entanglement-based scheme are equivalent. Then, we show that this protocol is secure against Gaussian collective attacks even if the channel is lossy and noisy, and further, a lower bound to the secure key rate is derived.

4 pages and 3 figures; Two references (ref. [1] and [2] in this new version) are added;

References in corpus (6)

• Unconditional optimality of Gaussian attacks against continuous-variable QKD
• Quantum key distribution over 25 km with an all-fiber continuous-variable system
• Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography
• Symplectic invariants, entropic measures and correlations of Gaussian states
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• A modified practical homodyne detector model for continuous-variable quantum key distribution: detailed security analysis and improvement by the phase-sensitive amplifier
• An improved two-way continuous-variable quantum key distribution protocol with added noise in homodyne detection
• Direct measurement of coherent light proportion from a practical laser source