Coherent State Quantum Key Distribution with Multi Letter Phase-Shift Keying

Abstract

We present a protocol for quantum key distribution using discrete modulation of coherent states of light. Information is encoded in the variable phase of coherent states which can be chosen from a regular discrete set ranging from binary to continuous modulation, similar to phase-shift-keying in classical communication. Information is decoded by simultaneous homodyne measurement of both quadratures and requires no active choice of basis. The protocol utilizes either direct or reverse reconciliation, both with and without postselection. We analyze the security of the protocol and show how to enhance it by the optimal choice of all variable parameters of the quantum signal.

11 pages, 2 figures, 1 table. Comments welcome

References in corpus (7)

• The Security of Practical Quantum Key Distribution
• Distillation of secret key and entanglement from quantum states
• Symmetry implies independence
• Continuous Variable Quantum Cryptography using Two-Way Quantum Communication
• Feasibility of free space quantum key distribution with coherent polarization states
• Efficient-phase-encoding protocols for continuous-variable quantum key distribution using coherent states and postselection
• Witnessing effective entanglement in a continuous variable prepare&measure setup and application to a QKD scheme using postselection

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• A security proof of continuous-variable QKD using three coherent states
• Finite-Size Security for Discrete-Modulated Continuous-Variable Quantum Key Distribution Protocols
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• Optimizing Continuous-Variable Quantum Key Distribution with Phase-Shift Keying Modulation and Postselection
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• Adaptive generalized measurement for unambiguous state discrimination of quaternary phase-shift-keying coherent states
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• Noiseless Linear Amplification and Loss-Tolerant Quantum Relay using Coherent State Superpositions
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• Teleportation-Based Continuous Variable Quantum Cryptography
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• An introductory review of the theory of continuous-variable quantum key distribution: Fundamentals, protocols, and security
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