21 May 2018 Modeling high quantum bit rate QKD systems over optical fiber
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There is considerable interest in finding conditions under which the quantum key distribution (QKD) propagation distances over fiber and secure key rate (SKR) are maximized for a given acceptable quantum bit error rate. One way to increase the secure key rate is to increase quantum bit rate, i.e. use shorter pulses. Short pulses propagating in a fiber are subject to temporal broadening caused by chromatic dispersion (CD) which leads to inter-symbol-interference and quantum bit-error rate increase. Current commercial QKD systems employ 1 Gb/s quantum bit rate sources, and the transition to 10 Gb/s system is being researched. While not very important in the 1 Gb/s, the effect of CD cannot be neglected in 10 Gb/s or higher quantum bit rate systems.
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Michal Mlejnek, Nikolay A. Kaliteevskiy, Daniel A. Nolan, "Modeling high quantum bit rate QKD systems over optical fiber", Proc. SPIE 10674, Quantum Technologies 2018, 1067416 (21 May 2018); doi: 10.1117/12.2306875; https://doi.org/10.1117/12.2306875

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