Modulation leakage-free continuous-variable quantum key distribution
- URL: http://arxiv.org/abs/2205.07245v1
- Date: Sun, 15 May 2022 10:07:19 GMT
- Title: Modulation leakage-free continuous-variable quantum key distribution
- Authors: Adnan A.E. Hajomer, Nitin Jain, Hossein Mani, Hou-Man Chin, Ulirk L.
Andersen, Tobias Gehrin
- Abstract summary: Continuous-variable (CV) QKD based on coherent states is an attractive scheme for secure communication.
This work is a step towards protecting CVQKD systems against practical imperfections of physical devices and operational limitations without performance degradation.
- Score: 1.8268488712787332
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Distributing cryptographic keys over public channels in a way that can
provide information-theoretic security is the holy grail for secure
communication. This can be achieved by exploiting quantum mechanical principles
in so-called quantum key distribution (QKD). Continuous-variable (CV) QKD based
on coherent states, in particular, is an attractive scheme for secure
communication since it requires only standard telecommunication technology that
can operate at room temperature. However, a recently discovered side-channel
created in the process of state preparation leads to a leakage of information
about the transmitted quantum state, opening a security loophole for
eavesdroppers to compromise the security of the CVQKD system. Here, we present
a CVQKD system without this modulation leakage vulnerability. Our
implementation is based on a baseband modulation approach, and uses an in-phase
and quadrature (IQ) modulator for state preparation and radio frequency
heterodyne detection together with carefully designed digital signal processing
for state measurement. We consider practical aspects in the implementation and
demonstrate the generation of a composable secret key secure against collective
attacks. This work is a step towards protecting CVQKD systems against practical
imperfections of physical devices and operational limitations without
performance degradation.
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