A comprehensive decoy-state quantum key distribution model for practical single photon sources

Hui Li

Due to the imperfect single photon source and the loss channel in real-life quantum key distribution systems,most current quantum communication experiments based on attenuated laser pulses are insecure under photon number splitting attack.Decoy state method,which is proposed as a useful and effective way to unconditionally secure quantum key distribution grounded on current technology,has become an important branch of quantum communication in recent years.Combined with the general model of quantum key distribution system,a comprehensive review is presented about typical schemes of decoy state method.Then the experimental research on decoy state method is reviewed briefly and the future direction is prospected in the end.

Wang, Chen, GUILHERME BARRETO XAVIER +7 more

Qin Wang, Xiang‐Bin Wang, Guang‐Can Guo

We propose a practical decoy-state method with heralded single-photon source for quantum key distribution (QKD). In the protocol, three intensities are used and one can estimate the fraction of single-photon counts. The final key rate over transmission distance is simulated under various parameter sets. Due to the lower dark count than that of a coherent state, it is shown that a three-intensity decoy-state QKD with a heralded source can work for a longer distance than that of a coherent state.

頼俊 足立

Xoel Sixto, Guillermo Currás-Lorenzo, Margarida Pereira +3 more

Decoy-state quantum key distribution (QKD) is the most widely adopted approach for overcoming the limitations of imperfect single-photon sources. However, existing security proofs typically either neglect important device imperfections or rely on assumptions that are difficult to justify in realistic high-speed implementations, such as the independent and identically distributed nature of the emitted signals. In this work, we combine and extend several recent theoretical advances to provide a comprehensive analytical finite-key security proof for decoy-state QKD that simultaneously incorporates multiple practically relevant transmitter and receiver imperfections, including state-preparation flaws, bit and basis side-channel leakage and correlations, setting-independent intensity fluctuations, and detection-efficiency mismatches.

Yefeng He, Wenping Ma