Zhou, H, Zeng, P, Razavi, M orcid.org/0000-0003-4172-2125 et al. (1 more author) (2018) Randomness quantification of coherent detection. Physical Review A, 98 (4). ARTN 042321. ISSN 1050-2947
Abstract
Continuous-variable quantum cryptographic systems, including random number generation and key distribution, are often based on coherent detection. The essence of the security analysis lies in the randomness quantification. Previous analyses employ a semi-quantum picture, where the strong local oscillator limit is assumed. Here, we investigate the randomness of homodyne detection in a full quantum scenario by accounting for the shot noise in the local oscillator, which requires us to develop randomness measures in the infinite-dimensional scenario. Similar to the finite-dimensional case, our introduced measure of randomness corresponds to the relative entropy of coherence defined for an infinite-dimensional system. Our results are applicable to general coherent detection systems, in which the local oscillator is inevitably of finite power. As an application example, we employ the analysis method to a practical vacuum-fluctuation quantum random number generator and explore the limits of generation rate given a continuous-wave laser.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | ©2018 American Physical Society. This is an author produced version of a paper published in Physical Review A. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | quant-ph; quant-ph |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) |
Funding Information: | Funder Grant number EPSRC EP/M013472/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Oct 2018 15:16 |
Last Modified: | 27 Oct 2018 07:20 |
Status: | Published |
Publisher: | American Physical Society |
Identification Number: | 10.1103/PhysRevA.98.042321 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:134652 |