On the Optimal Mean Photon Number for Quantum Cryptography

摘要: The optimal mean photon number (mu) for quantum cryptography is the average per transmitted pulse that results in highest delivery rate of distilled cryptographic key bits, given a specific system scenario and set assumptions about Eve's capabilities. Although many experimental systems have employed 0.1 practice, several research teams pointed out this value somewhat arbitrary. In fact, various values mu been described literature. In paper we offer detailed analytic model an experimental, fiber-based system, explicit reasonable current technical We explicitly total behavior ranging from physical effects to protocols such as error correction privacy amplification. then derive range scenarios. One interesting result approximately 1.1 wide realistic, QKD systems; it provides nearly 10 times throughput employ more conventional = 0.1, without any adverse affect on security, judged against