Performance analysis of d-dimensional quantum cryptography under state-dependent diffraction
Abstract
Standard protocols for quantum key distribution (QKD) require that the sender be able to transmit in two or more mutually unbiased bases. Here, we analyze the extent to which the performance of QKD is degraded by diffraction effects that become relevant for long propagation distances and limited sizes of apertures. In such a scenario, different states experience different amounts of diffraction, leading to state-dependent loss and phase acquisition, causing an increased error rate and security loophole at the receiver. To solve this problem, we propose a precompensation protocol based on preshaping the transverse structure of quantum states. We demonstrate, both theoretically and experimentally, that when performing QKD over a link with known, state-dependent loss and phase shift, the performance of QKD will be better if we intentionally increase the loss of certain states to make the loss and phase shift of all states equal. Our results show that the precompensated protocol can significantly reduce the error rate induced by state-dependent diffraction and thereby improve the secure key rate of QKD systems without sacrificing the security.
Additional Information
© 2019 American Physical Society. Received 18 December 2018; published 13 September 2019. We acknowledge helpful discussions with B. Gao, C. Liu, and K. Pang. This work was supported by the U.S. Office of Naval Research. R.W.B. acknowledges support from Canada Research Chairs Program and the National Science and Engineering Research Council of Canada. B.B. acknowledges the support of a Banting postdoctoral fellowship.Attached Files
Published - PhysRevA.100.032319.pdf
Submitted - 1812.07070.pdf
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Additional details
- Eprint ID
- 97162
- Resolver ID
- CaltechAUTHORS:20190716-085941770
- Office of Naval Research (ONR)
- Canada Research Chairs Program
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- University of Ottawa
- Created
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2019-07-16Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field