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Security bound of continuous-variable quantum key distribution with discrete modulation

Shen Yong Zou Hong-Xin

Security bound of continuous-variable quantum key distribution with discrete modulation

Shen Yong, Zou Hong-Xin
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Publishing process
  • Received Date:  08 May 2009
  • Accepted Date:  22 June 2009
  • Published Online:  15 March 2010

Security bound of continuous-variable quantum key distribution with discrete modulation

  • 1. 国防科学技术大学理学院物理系 长沙 410073

Abstract: Security of continuous-variable quantum key distribution with four-state protocol based on discrete modulation of noisy coherent states is analyzed. Combing discrete modulation and reverse reconciliation, this protocol can be used for long distance cryptography. There is a small difference between the state Alice sends in the discrete modulation protocol and the Gaussian modulation protocol, and it can be treated as excess noise and loss in the channel. As Alice cannot do a precise modulation, she will induce noise to the coherent state. We look this noise as the source noise and derive a lower bound to the secure key rate assuming the eavesdropper cannot benefit from the noise in the source. For avoiding the fast and random phase locking between the signal and local oscillator in experiment, we also analyze the security of four-state protocol using no-switching scheme.

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