Decoy states for quantum key distribution based on decoherence-free subspaces

Abstract

Quantum key distribution with decoherence-free subspaces has been proposed to overcome the collective noise to the polarization modes of photons flying in quantum channel. Prototype of this scheme have also been achieved with parametric-down conversion source. However, a novel type of photon-number-splitting attack we proposed in this paper will make the practical implementations of this scheme insecure since the parametricdown conversion source may emit multi-photon pairs occasionally. We propose decoy states method to make these implementations immune to this attack. And with this decoy states method, both the security distance and key bit rate will be increased.

A Modified Quantum Key Distribution Without Public Announcement Bases Against Photon-Number-Splitting Attack

“…This attack can threaten the security of some quantum cryptography protocols in real circumstance, which are unconditional secure in ideal condition, and become one of main obstacles to the implementation of QKD. Thus, the security of some famous quantum cryptography protocols in PNS attack have been studied widely [30][31][32][33][34][35][36][37][38][39][40][41].…”

Quantum key distribution protocols with six-photon states against collective noise

“…Generally speaking, the fluctuation is slow in time, therefore collective noise model is reasonable, where adjacent photons are assumed to be affected by the same noise. Efforts in this direction are made recently [16][17][18][19][20][21][22][23][24][25].…”

Practical SARG04 quantum key distribution

“…Many methods have been developed to improve the performance of the decoy states QKD, including more decoy states (Wang 2005), nonorthogonal decoy-state method (Li and Fang 2006), photon number-resolving method (Cai and Tan 2007), herald single photon source method (Horikiri and Kobayashi 2006;Wang et al 2007a), modified coherent state source method (Yin et al 2007), the intensity fluctuations of the laser pulses (Wang et al 2007b) and (Wang 2007). Some prototypes of decoy state QKD have been already implemented (Zhao et al 2008(Zhao et al , 2006Peng et al 2007;Rosenberg et al 2007;Yuan et al 2007;Schmitt-Manderbach et al 2007;Yin et al 2008;Tan and Cai 2010;Curty et al 2010;Ali and Wahiddin 2010;Meyer-Scott et al 2011;Zhou and Zhou 2011).…”