Security of quantum cryptography using balanced homodyne detection

Abstract

In this paper we investigate the security of a quantum cryptographic scheme which utilizes balanced homodyne detection and weak coherent pulse (WCP). The performance of the system is mainly characterized by the intensity of the WCP and postselected threshold. Two of the simplest intercept/resend eavesdropping attacks are analyzed. The secure key gain for a given loss is also discussed in terms of the pulse intensity and threshold.

RevTeX4, 8pages, 7 figures

References in corpus (3)

• Continuous variable quantum cryptography using coherent states
• Continuous Variable Quantum Cryptography - beating the 3 dB loss limit
• Conditional beam splitting attack on quantum key distribution

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