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arXiv:0704.3833 · Physical Review A

Decoy state quantum key distribution with modified coherent state

Zhen−Qiang Yin, Zheng‐Fu Han, Fang‐Wen Sun, Guang‐Can Guo

Published Jul 16, 2007• 45 citations
arXivHTMLPDF

Abstract

To beat photon-number splitting attack, decoy state quantum key distribution (QKD) based on the coherent state has been studied widely. We present a decoy state QKD protocol with a modified coherent state (MCS). By destructive quantum interference, a MCS with fewer multiphoton events can be obtained, which may improve the key bit rate and security distance of QKD. Through numerical simulation, we show about a 2-dB increment on the security distance for Bennett-Brassard (1984) protocol.

DOI
10.1103/physreva.76.014304

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To beat photon-number splitting attack, decoy state quantum key distribution (QKD) based on the coherent state has been studied widely. We present a decoy state QKD protocol with a modified coherent state (MCS). By destructive quantum interference, a MCS with fewer multiphoton events can be obtained, which may improve the key bit rate and security distance of QKD. Through numerical simulation, we show about a 2-dB increment on the security distance for Bennett-Brassard (1984) protocol.
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We propose to implement reference-frame-independent measurement-device-independent quantum key distribution (RFI-MDI-QKD) with modified coherent states (MCS), and give the universal analytical formulas of three-intensity decoy-state RFI-MDI-QKD with MCS. Our simulation results indicate that compared with the widely used weak coherent states, MCS can improve significantly both the secret key rate and secure transmission distance of RFI-MDI-QKD, which is mainly attributed to the elimination of certain multi-photon events through the quantum interference effect in MCS.
To increase the security distance of quantum communication,a new scheme of decoy state quantum key distribution with a modified coherent state is proposed.The probability of multi-photon pulse in weak coherent source can be decreased by canceling two photon pulses to improve the security distance.Based on the math model of the decoy state QKD,the formula for the yield and error rate of the single photon pulse with the Modified Coherent State is deduced,and substituted in GLLP to calculate the generation rate of quantum keys.Results show that the decoy state with the Modified Coherent State can increase the secure communication distance about 10%,which is very close to that of the perfect decoy state QKD.
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Abstract Quantum cryptography or, more precisely, quantum key distribution (QKD), is one of the advanced areas in the field of quantum technologies. The confidentiality of keys distributed with the use of QKD protocols is guaranteed by the fundamental laws of quantum mechanics. This paper is devoted to the decoy state method, a countermeasure against vulnerabilities caused by the use of coherent states of light for QKD protocols whose security is proved under the assumption of single-photon states. We give a formal security proof of the decoy state method against all possible attacks. We compare two widely known attacks on multiphoton pulses: photon-number splitting and beam splitting. Finally, we discuss the equivalence of polarization and phase coding.