Abstract
The purpose of this paper is to compare the performance of four passive optical network topologies in implementing multi-user quantum key distribution, using 3 protocols proposed by quantum cryptography (B92, EPR, and SSP). The considered networks are the passive-star network, the optical-ring network based on the Signac interferometer, the wavelength-routed network, and the wavelength-addressed bus network. The quantum bit-error rate and sifted key rate for each of these topologies are analysed to determine their suitability for providing quantum key distribution-service to networks of various sizes. The efficiency of the three considered protocols is also determined.
Highlights
The quantum cryptography term represents the set of the techniques which allow two entities, Alice and Bob, to exchange reserved information by means of a quantum channel
The purpose of this paper is to compare the performance of four passive optical network topologies in implementing multi-user quantum key distribution, using 3 protocols proposed by quantum cryptography (B92, EPR, and Six State Protocol (SSP))
Wavelength network: 1) is the most suitable for networks with more than 64 users, because its Sifted key Rate is independent of the number of users on the network; 2) it may not be the best choice for networks that are not expected to expand beyond 64 users because since it has the highest structure loss (7.3 dB)
Summary
The quantum cryptography term represents the set of the techniques which allow two entities, Alice and Bob, to exchange reserved information by means of a quantum channel. To share a secret key, Alice and Bob must follow a protocol (BB84, B92, EPR, SSP). Once developed the procedure requested by the protocol, if any eavesdropper were not noticed, Alice and Bob share a secret key, which exchanged themselves without having to turn to a third reliable part and initially sharing no information, except that the one necessary to authenticate their communications part. The QBER and the RSIFT are considered the fundamental parameters to evaluate the performances of a quantum channel This analysis has already been done for BB84 protocol [3].
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