Security and implementation of differential phase shift quantum key distribution systems

Laszlo Gyongyosi, Sándor Imre

ABSTRACT This paper analyzes the information‐theoretical security of the of Differential Phase Shift (DPS) Quantum Key Distribution (QKD) protocol, using efficient computational information geometric algorithms. The protocol was introduced for practical reasons, since the earlier QKD schemes were too complicated to implement in practice. The DPS QKD protocol can be an integrated part of current network security applications; hence its practical implementation is much easier with the current optical devices and optical networks. The proposed algorithm could be a very valuable tool to answer the still open questions related to the security bounds of the DPS QKD protocol. Copyright © 2012 John Wiley & Sons, Ltd.

Masato Koashi

Hiroki Takesue

Rongzhen Jiao, Feng Chen-Xu, 北京邮电大学理学院，北京 100876

The performance of a two-way quantum-key-distribution (QKD) system are analyzed using the differential-phase-shift keying (DPSK) protocol. The comparison is based on the secure communication rate as a function of distance for three QKD protocols: the Bennett-Brassard 1984, the Bennett-Brassard-Mermin 1992, and the coherent differential-phase-shift keying protocols. We discussed the security of DPSK protocol against any type of individual photon splitting attack and concluded that the simple and efficient DPSK protocol allows for more than 200km of secure communication distance with high communication rates.

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Abdelrahman E. Afifi, Jeff F. Young, Sudip Shekhar +1 more

We present a system-level analysis for a differential phase shift (DPS) quantum key distribution protocol implemented in silicon photonics technology. We estimate the secure key rate versus link length for different types of single-photon detectors and optical coupling components employed in the DPS receivers.