Experimental multiuser quantum key distribution network using a wavelength-addressed bus architecture

Performance limits for single-photons, correlated-photons, and entangled photons for quantum key distribution over fiber optics network topologies

“…(2,3,4,5,6,7,8,9,10,11,12,13) For coherent laser source The QBER for coherent photons is [8] Proc For the 1XN without wavelength router the QBER is…”

“…Simulation results for the star network with wavelength router using coherent light as. The graph shows number of uses from the bottom up (2,3,4,5,6,7,8,9,10,11,12,13) Figure 5 depicts simulation results for the ring network (top curve), star with wavelength router (flat line), bus networks (middle curve) and star without wavelength router (bottom curve). It is seen that the star with wavelength router allows for large number of users for QKD over the network aided by the fact that each user is assigned a dedicated wavelength.…”

“…Most of current practical demonstrations of QKD system designed for only two users, limit their usefulness for network communications. Work towards the expansion of two-user point-to-point QKD systems to multi-user networks is progressing steadily and will allow QKD achieve widespread use in practical environments [4,5] Optical components such as couplers, routers, wavelength divisions multiplexers (WDM), as well as the architecture to enable the transmission and distribution of data between multiple users will introduces losses, and signal-to-noise degradation in a way that will affect QKD performance including quantum-bit-error rate, raw key rate, errorcorrection, as then network size and/or transmission distances increases [6,7] In this letter, we characterize the performance of different fiber optic network topologies for implementing multi-user quantum key distribution including a) the star network b) the bus network and c) the ring network previously reported in [4] and reproduced here for convenience in figures 1-4 respectively. To allow for a common comparison of these networks for use in multi-user QKD vis-à-vis the data carriers, we shall use the QBER as the common measure.…”

Quantum Cryptography

“…In the 1990s, A looped and branched network was firstly proposed (Townsend, et al, 1994), then QKD sessions between one controller and several terminals in a branched network were demonstrated, in which the kernel part is a beam splitter (Towsend, 1997). After that, several QKD local network topologies have been proposed with optical methods (Nishioka, et al, 2002;Kumavor , et al, 2006;Fernandez, et al, 2007;Ma, et al, 2007;Zhang, et al, 2008 ). In this chapter, we will focus on the metropolitan fiber QKD networks set up by optical components.…”

Multi-client quantum key distribution using wavelength division multiplexing

“…A few studies have focused on the feasibility of transmitting quantum signals alongside conventional high-powered, classical signals in a fiber network [1,2]. Other efforts have focused on the development of multiuser QKD networks using conventional telecom components [3,4]. In these studies, however, quantum communication is centralized, occurring between a server and one or more clients.…”