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International Journal of Digital Content Technology and its Applications

Analytical Research on Error Rate of Quantum Key Distribution

ZHOU Yanjie -, WEN Min -

Published Feb 13, 2013• 0 citations
Publisher
DOI
10.4156/jdcta.vol7.issue3.43

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We propose a postselection technique, based on quantum error detection, for quantum key distribution (QKD) systems that run over quantum repeaters with encoding. In such repeaters, quantum error-correction techniques are used for entanglement distillation. By developing an analytical approach to study such quantum repeaters, we show that, in the context of QKD, it is often more efficient to use the error-detection, rather than the error-correction, capability of the underlying code to sift out cases where an error has been detected. We implement our technique for three-qubit repetition codes by modeling different sources of error in crucial components of the system. We then investigate in detail the impact of such imperfections on the secret key generation rate of the QKD system, and how one can use the information obtained during entanglement swapping and decoding stages to maximize the rate. For benchmarking purposes, we specify the maximum allowed error rates in different components of the setup below which positive key rates can be obtained.
Recently, quantum key distribution (QKD) has emerged as a prominent solution to provide secure and reliable communication in atmosphere. This paper investigates the effect of pointing error on the performance of QKD communication systems. The analytical solution of error and sift probabilities, quantum bit error rate (QBER) and secret key rate (SKR) are obtained depending on pointing error effect that is modeled by Rayleigh and Hoyt distributions. Our findings show that the increased beam waist, hence the increased pointing error, degrades the performance of QKD communication systems remarkably. Also, the symmetric pointing error, where horizontal and vertical pointing errors are equal, yields worse performance for QKD systems as compared to the asymmetric pointing error case where vertical and horizontal pointing errors are different. The undeniable effect of pointing error on the performance of QKD system highlights the importance of precise beam alignment to minimize the adverse effects of pointing errors, thereby ensuring the secure and efficient operation of QKD systems in various deployment scenarios.