Reference-frame-independent quantum key distribution (RFI-QKD) can allow a quantum key distribution system to obtain the ideal key rate and transmission distance without reference system calibration, which has attracted much attention. Here, we propose an RFI-QKD protocol based on wavelength division multiplexing (WDM) considering finite-key analysis and crosstalk. The finite-key bound for RFI-QKD with decoy states is derived under the crosstalk of WDM. The resulting secret key rate of RFI-QKD, which is more rigorous, is obtained. Simulation results reveal that the secret key rate of RFI-QKD based on WDM is affected by the multiplexing channel number, as well as crosstalk between adjacent channels.
Quantum key distribution (QKD) generates information-theoretical secret keys between two parties based on the physical laws of quantum mechanics. With the development of quantum communication network, it is feasible and economical to combine QKD with classical optical communication through the same fiber by using dense wavelength division multiplexing (DWDM) technology. In this paper, a detail scheme of TF-QKD protocol with DWDM technology is proposed and the performance is analyzed, which takes the influence of quantum channel number and adjacent quantum crosstalk on the secret key rates into considering. The simulation results show that the scheme further increases the secret key rate of TF-QKD and its variants. Therefore, this scheme provides a method to improve the secret key rate for practical quantum networks.
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