46,117 research outputs found
Measurement-device-independent quantum communication with an untrusted source
Measurement-device-independent quantum key distribution (MDI-QKD) can provide
enhanced security, as compared to traditional QKD, and it constitutes an
important framework for a quantum network with an untrusted network server.
Still, a key assumption in MDI-QKD is that the sources are trusted. We propose
here a MDI quantum network with a single untrusted source. We have derived a
complete proof of the unconditional security of MDI-QKD with an untrusted
source. Using simulations, we have considered various real-life imperfections
in its implementation, and the simulation results show that MDI-QKD with an
untrusted source provides a key generation rate that is close to the rate of
initial MDI-QKD in the asymptotic setting. Our work proves the feasibility of
the realization of a quantum network. The network users need only low-cost
modulation devices, and they can share both an expensive detector and a
complicated laser provided by an untrusted network server.Comment: 13 pages, 4 figures. arXiv admin note: the security proof technique
is based on arXiv:0802.2725, arXiv:0905.4225
Measurement-device-independent QKD with Modified Coherent State
The measurement-device-independent quantum key distribution (MDI-QKD)
protocol has been proposed for the purpose of removing the detector side
channel attacks. Due to the multi-photon events of coherent states sources,
real-life implementations of MDI-QKD protocol must employ decoy states to beat
the photon-number-splitting attack. Decoy states for MDI-QKD based on the weak
coherent states have been studied recently. In this paper, we propose to
perform MDI-QKD protocol with modified coherent states (MCS) sources. We
simulate the performance of MDI-QKD with the decoy states based on MCS sources.
And our simulation indicates that both the secure-key rate and transmission
distance can be improved evidently with MCS sources.The physics behind this
improvement is that the probability of multi-photon events of the MCS is lower
than that of weak coherent states while at the same time the probability of
single-photon is higher
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