Upper security bounds for coherent-one-way quantum key distribution
- URL: http://arxiv.org/abs/2006.16891v2
- Date: Mon, 4 Jan 2021 16:37:56 GMT
- Title: Upper security bounds for coherent-one-way quantum key distribution
- Authors: Javier Gonz\'alez-Payo, R\'obert Tr\'enyi, Weilong Wang, Marcos Curty
- Abstract summary: Coherent-one-way (COW) QKD has been introduced as a promising solution to overcome this limitation.
Thanks to its experimental simplicity, the COW protocol is already used in commercial applications.
We derive simple upper security bounds on its secret key rate, which demonstrate that it scales at most quadratically with the system's transmittance.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The performance of quantum key distribution (QKD) is severely limited by
multi-photon pulses emitted by laser sources due to the photon-number splitting
attack. Coherent-one-way (COW) QKD has been introduced as a promising solution
to overcome this limitation, and thus extend the achievable distance of
practical QKD. Indeed, thanks to its experimental simplicity, the COW protocol
is already used in commercial applications. Here, we derive simple upper
security bounds on its secret key rate, which demonstrate that it scales at
most quadratically with the system's transmittance, thus solving a
long-standing problem. That is, in contrast to what has been claimed, this
approach is inappropriate for long-distance QKD transmission. Remarkably, our
findings imply that all implementations of the COW protocol performed so far
are insecure.
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