Perspectives of microwave quantum key distribution in open-air
- URL: http://arxiv.org/abs/2203.05530v1
- Date: Thu, 10 Mar 2022 18:27:51 GMT
- Title: Perspectives of microwave quantum key distribution in open-air
- Authors: Florian Fesquet, Fabian Kronowetter, Michael Renger, Qiming Chen,
Kedar Honasoge, Oscar Gargiulo, Yuki Nojiri, Achim Marx, Frank Deppe, Rudolf
Gross, Kirill G. Fedorov
- Abstract summary: We investigate the perspectives of continuous-variable open-air quantum key distribution at microwave frequencies.
We show that microwaves can potentially outperform conventional quantum key distribution at telecom wavelength at imperfect weather conditions.
- Score: 0.817918559522319
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: One of the cornerstones of quantum communication is the unconditionally
secure distribution of classical keys between remote parties. This key feature
of quantum technology is based on the quantum properties of propagating
electromagnetic waves, such as entanglement, or the no-cloning theorem.
However, these quantum resources are known to be susceptible to noise and
losses, which are omnipresent in open-air communication scenarios. In this
work, we theoretically investigate the perspectives of continuous-variable
open-air quantum key distribution at microwave frequencies. In particular, we
present a model describing the coupling of propagating microwaves with a noisy
environment. Using a protocol based on displaced squeezed states, we
demonstrate that continuous-variable quantum key distribution with propagating
microwaves can be unconditionally secure at room temperature up to distances of
around 200 meters. Moreover, we show that microwaves can potentially outperform
conventional quantum key distribution at telecom wavelength at imperfect
weather conditions.
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