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Quantum
Information and Computation
ISSN: 1533-7146
published since 2001
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Vol.17 No.5&6 May 2017 |
CV-MDI quantum key distribution via satellite
(pp0361-0379)
Nedasadat Hosseinidehaj and Robert Malaney
doi:
https://doi.org/10.26421/QIC17.5-6-1
Abstracts:
In this work we analyze a measurement-device-independent (MDI) protocol
to establish continuous-variable (CV) quantum key distribution (QKD)
between two ground stations. We assume communication occurs between the
ground stations via satellite over two independent atmospheric-fading
channels influenced by turbulence-induced beam wandering. In this MDI
protocol the measurement device is the satellite itself, and the
security of the protocol is analyzed through an equivalent
entanglement-based swapping scheme. We quantify the positive impact the
fading channels can have on the final quantum key rates, demonstrating
how the protocol is able to generate a positive key rate even over
high-loss atmospheric channels provided that the maximum transmission
coefficient of the channel is sufficiently large. This is somewhat
counter-intuitive given that the same outcome is only possible in the
low-loss regime for a measurement device centrally positioned in a
fiber-optic channel. Our results show that useful space-based quantum
key generation rates between two ground stations are possible even when
the relay satellite is held by an adversary. The cost in key rate
incurred by altering the status of the satellite from trustworthy to
untrustworthy is presented.
Key words: CV-QKD, MDI
protocol, atmospheric-fading channels |
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