RF-subcarrier-assisted four-state continuous-variable QKD based on coherent detection

Zhen Qu, Ivan B. Djordjevic, Mark A. Neifeld

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


We theoretically investigate and experimentally demonstrate a RF-assisted four-state continuous-variable quantum key distribution (CV-QKD) system. Classical coherent detection is implemented with a simple digital phase noise cancelation scheme. In the proposed system, there is no need for frequency and phase locking between the quantum signals and the local oscillator laser. Moreover, in principle, there is no residual phase noise, and a mean excess noise of 0.0115 (in shot-noise units) can be acquired experimentally. In addition, the minimum transmittance of 0.45 is reached experimentally for secure transmission with commercial photodetectors, and the maximum secret key rate (SKR) of >12 Mbit/s can be obtained. The proposed RF-assisted CV-QKD system opens the door of incorporating microwave photonics into a CV-QKD system and improving the SKR significantly.

Original languageEnglish (US)
Pages (from-to)5507-5510
Number of pages4
JournalOptics letters
Issue number23
StatePublished - Dec 1 2016

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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