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Optical science and engineering

Quantum Communications with Optical Fibers

S. Iblisdir, Wolfgang Tittel, Nicolas Gisin, Hugo Zbinden

Published Nov 14, 2005• 1 citation
Publisher
DOI
10.1201/9781420026603.ch2

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In the absence of quantum repeaters, quantum communication proved to be nearly impossible across optical fibers longer than ≳20 km due to the drop of transmissivity below the critical threshold of 1/2. However, if the signals fed into the fiber are separated by a sufficiently short time interval, memory effects must be taken into account. In this Letter, we show that by properly accounting for these effects it is possible to devise schemes that enable unassisted quantum communication across arbitrarily long optical fibers at a fixed positive qubit transmission rate. We also demonstrate how to achieve entanglement-assisted communication over arbitrarily long distances at a rate of the same order of the maximum achievable in the unassisted noiseless case.