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Quantum Information Processing

Composable security of unidimensional continuous-variable quantum key distribution

  • 01-05-2018
Published in:
Authors
Qin Liao
Ying Guo
Cailang Xie
Duan Huang
Peng Huang
Guihua Zeng
Published in
Quantum Information Processing | Issue 5/2018

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Abstract

We investigate the composable security of unidimensional continuous-variable quantum key distribution (UCVQKD) protocol in generally phase-sensitive channel; the UCVQKD protocol is based on the Gaussian modulation of a single quadrature of the coherent state of light, aiming to provide a simple implementation of key distribution compared to the symmetrically modulated Gaussian coherent-state protocols. This protocol neglects the necessity in one of the quadrature modulations in coherent states and hence reduces the system complexity. To clarify the influence of finite-size effect and the cost of performance degeneration, we establish the relationship of the balanced parameters of the unmodulated quadrature and estimate the precise secure region. Subsequently, we illustrate the composable security of the UCVQKD protocol against collective attacks and achieve the tightest bound of the UCVQKD protocol. Numerical simulations show the asymptotic secret key rate of the UCVQKD protocol, together with the symmetrically modulated Gaussian coherent-state protocols.

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previous article Recurrent neural network approach to quantum signal: coherent state restoration for continuous-variable quantum key distribution
next article Quantum demultiplexer of quantum parameter-estimation information in quantum networks
Title
Composable security of unidimensional continuous-variable quantum key distribution
Authors
Qin Liao
Ying Guo
Cailang Xie
Duan Huang
Peng Huang
Guihua Zeng
Publication date
01-05-2018
Publisher
Springer US
Published in
Quantum Information Processing / Issue 5/2018
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-018-1881-2
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