Quantum cryptography

Unconditional security of the Bennett 1992 quantum-key-distribution scheme with a strong reference pulse

“…where n 01,ν /(n 01,ν +n 10,ν ) = sin 2 θ (ν) 1 and m 01,ν /(m 01,ν + m 10,ν ) = sin 2 φ (ν) 1 . In addition, n Ω,ν can be expressed as…”

“…So far, several QKD protocols have been proposed and experimentally demonstrated [1]. In real life QKD, loss and noises in the quantum channel limit the achievable distance.…”

Secure Long-Distance Quantum Communication over Optical Fiber Quantum Channels

“…Moreover, the DPS QKD protocol can be implemented in long-distance quantum communications, between the quantum repeater nodes. As follows, we will focus on this QKD scheme, however there are many other QKD schemes available, see (Branciard et al, 2005), (Dušek et al, 2006), (Hübel et al, 2007), (Gomez-Sousa & Curty, 2009), (Kwiat et al, 2001), (Niederberger et al, 2005), (Renner et al, 2005).…”

“…The DPS QKD protocol has deep relevance to practical applications, since the differential phase shift QKD protocol is much simpler in hardware design than the well known QKD protocols, such as BB84 or the Six-state QKD protocols. Results on the security of DPS QKD protocol was published by Assche (Van Assche et al, 2004), Branciard, Gisin, and Scarani (Branciard et al, 2008), and several other attacks against various QKD schemes have been studied by Acín04 (Acín et al, 2004) (Dušek et al, 2006), Fasel (Fasel et al, 2004), Branciard (Branciard et al, 2005), and Gomez-Sousa and Curty (Gomez-Sousa & Curty, 2009), Hübel (Hübel et al, 2007), Niederberger (Niederberger et al, 2005), Renner05 (Renner et al, 2005).…”

Single-photon quantum key distribution in the presence of loss

“…Quantum key distribution (QKD) protocols typically involve a two-step procedure in order to generate a secret key [1,2]. First, the legitimate users (Alice and Bob) perform a set of measurements on effective bipartite quantum states that are distributed to them.…”