Abstract
The encoding in multiple degrees of freedom can effectively improve the performance of current quantum key distribution, but the collective channel noise reduces the security of these proposals. In this article, we propose a high capacity quantum key distribution with single-photon in polarization and spatial-mode degrees of freedom, and protect the quantum states against the general collective noise by error-rejection in two degrees of freedom and quantum channel multiplexing. The states transmission and measurements in the presented quantum key distribution can be realized deterministically. The security analysis under the intercept-measure-resend eavesdropping and controlled-NOT operation eavesdropping attacks is conducted to verify the security, and the secure key rate analysis proves the efficiency of our proposal. These advantages make our proposal useful in practical quantum communication under current experimental conditions.
Highlights
Quantum communication provides an method to absolute communication security between two remote parties [1,2,3,4,5]
To achieve the effective secure keys transmission with ability against general noise and higher secure key rate with less resources, we propose a high capacity Quantum key distribution (QKD) with photons encoded in polarization and spatial-mode degrees of freedom (DOF) against collective channel noise in this paper
We focus on the high capacity QKD against collective channel noise, and the secure key rate can be further improved by decoy state method with lower loss photonic switches
Summary
Quantum communication provides an method to absolute communication security between two remote parties [1,2,3,4,5]. The self-error-rejecting photonic qubit transmission in both of the polarization and spatial states over collective noise channels has been reported with the success probability of obtaining uncorrupted states of 1/4 using post-selection [31]. These advantages of error rejection were very useful in QKD to improve the security [32,33]. To achieve the effective secure keys transmission with ability against general noise and higher secure key rate with less resources, we propose a high capacity QKD with photons encoded in polarization and spatial-mode DOFs against collective channel noise in this paper. Error correction and privacy amplification are performed to get the final secure keys
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