Improvement of the safe transmission distance via optimization of the photon number distribution for the faint optical pulse in practical quantum key distribution systems

Qi, Zhantong; Du, Cong; Qin, Xiaolong; Wang, Jindong; Wei, Zhengjun; Zhang, Zhiming

doi:10.1140/epjd/e2019-90376-9

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…These detector arrays are easy to model physically, but the resulting probability distribution is computationally inefficient to evaluate for larger array sizes due to the high number of possible outcomes. This is problematic since the probability distribution can be used to, for example, improve of quantum key distribution [28] and to evaluate the performance of temporally multiplexed arrays [29].…”

Section: Introductionmentioning

confidence: 99%

Photon-counting distribution for arrays of single-photon detectors

Jönsson

Björk

2020

Phys. Rev. A

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We derive a computationally efficient expression of the photon counting distribution for a uniformly illuminated array of single photon detectors. The expression takes the number of single detectors, their quantum efficiency, and their dark-count rate into account. Using this distribution we compute the error of the array detector by comparing the output to that of a ideal detector. We conclude from the error analysis that the quantum efficiency must be very high in order for the detector to resolve a hand-full of photons with high probability. Furthermore, we conclude that in the worst-case scenario the required array size scales quadratically with the number of photons that should be resolved. We also simulate a temporal array and investigate how large the error is for different parameters and we compute optimal size of the array that yields the smallest error. * matjon4@kth.se † gbjork@kth.se

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Section: Introductionmentioning

confidence: 99%