Unidimensional continuous-variable quantum key distribution using squeezed states

Abstract

The possibility of using squeezed states in the recently suggested unidimensional continuous-variable quantum key distribution based on a single quadrature modulation is addressed. It is shown that squeezing of the signal states expands the physicality bounds of the effective entangled state shared between the trusted parties due to the antisqueezing noise in the unmodulated quadrature. Modulation of the antisqueezed quadrature, on the other hand, effectively shrinks the physicality bounds due to the squeezing in the unmodulated quadrature and also provides noise on the reference side of the protocol, thus limiting the possibility of eavesdropping in noisy channels. This strategy is practical for low-loss (i.e., short-distance) channels, especially if direct reconciliation scheme is applied.

7 pages, 6 figures

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Cited by in corpus (8)

• Advances in Quantum Cryptography
• Comparison of Discrete Variable and Continuous Variable Quantum Key Distribution Protocols with Phase Noise in the Thermal-Loss Channel
• Continuous-variable quantum communication
• Continuous-variable quantum key distribution over multispan links employing phase-insensitive and phase-sensitive amplifiers
• An introductory review of the theory of continuous-variable quantum key distribution: Fundamentals, protocols, and security
• Minimization of information leakage in continuous-variable quantum key distribution
• Quantum communications in continuous variable systems
• Continuous Variable Quantum Key Distribution with Single Quadrature Measurement at Arbitrary Reference Frame