@article{Walton:2021:1361-6455/ac2a6e,
author = {Walton, A and Ghesquiere, A and Brumpton, G and Jennings, D and Varcoe, B},
doi = {1361-6455/ac2a6e},
journal = {Journal of Physics B: Atomic, Molecular and Optical Physics},
title = {Thermal state quantum key distribution},
url = {http://dx.doi.org/10.1088/1361-6455/ac2a6e},
volume = {54},
year = {2021}
}

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TY  - JOUR
AB  - We analyse a central broadcast continuous variable quantum key distribution protocol in which a beam produced by a thermal source is used to create a secret key between two parties, Alice and Bob. A beam splitter divides the initial beam into a pair of output beams, which are sent to Alice and Bob, with Eve intercepting Bob's beam. We investigate the protocol in detail, calculating mutual informations through a pair of analytic methods and comparing the results to the outputs of a Monte Carlo simulation of the protocol. In a lossless system, we find that a lower bound on the key rate remains positive in the protocol under a beam splitter attack, provided Bob receives a nonzero proportion of the beam initially sent to him. This suggests that the thermal state protocol could be used experimentally to produce secure keys.
AU  - Walton,A
AU  - Ghesquiere,A
AU  - Brumpton,G
AU  - Jennings,D
AU  - Varcoe,B
DO  - 1361-6455/ac2a6e
PY  - 2021///
SN  - 0953-4075
TI  - Thermal state quantum key distribution
T2  - Journal of Physics B: Atomic, Molecular and Optical Physics
UR  - http://dx.doi.org/10.1088/1361-6455/ac2a6e
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000708652400001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://iopscience.iop.org/article/10.1088/1361-6455/ac2a6e
UR  - http://hdl.handle.net/10044/1/96478
VL  - 54
ER  - 

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