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Practical security analysis of continuous-variable quantum random number generator with noisy local oscillator | | Weinan Huang
; Yi-Chen Zhang
; Ziyong Zheng
; Yang Li
; Bingjie Xu
; Song Yu
; | | Date: |
6 Jul 2020 | | Abstract: | Quantum random number generator (QRNG) can theoretically generate
unpredictable random numbers with perfect devices, which is an ideal and secure
source of random numbers for cryptography. However, the practical
implementations always contain imperfections, which will greatly influence the
randomness of the final output and even open loophole to eavesdroppers.
Recently, J. Thewes et.al. experimentally demonstrate a continuous-variable
eavesdropping attack, based on heterodyne detection, on a trusted
continuous-variable QRNG in Phys. Rev. A 100, 052318 (2019), yet like many
other practical continuous-variable QRNG researches, they always suppose the
local oscillator is stable and ignore its fluctuation which might lead to
security threats such as wavelength attack. In this work, based on the theory
of the conditional min-entropy, imperfections on the practical security of
continuous-variable QRNG are systematically analyzed, especially the local
oscillator fluctuation under imbalanced homodyne detection. Experiments of a
practical QRNG based on vacuum fluctuation are demonstrated to show the
influence of local oscillator fluctuation on the total measurement noise
variances and the practical conditional min-entropy with beam splitters of
different transmittances. Moreover, a local oscillator monitoring method is
proposed for the practical continuous-variable QRNG, which can be used to
calibrate the practical conditional min-entropy. | | Source: | arXiv, 2007.2769 | | Services: | Forum | Review | PDF | Favorites | |
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