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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Information leakage via side channels in freespace BB84 quantum cryptography

Focus on Quantum Cryptography: Theory and Practice

Sebastian Nauerth1,3, Martin Fürst1, Tobias Schmitt-Manderbach1,2, Henning Weier1 and Harald Weinfurter1,2

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Part of Focus on Quantum Cryptography: Theory and Practice

While the BB84 protocol is in principle secure, real implementations suffer from imperfections. Here, we analyse a free space BB84 transmitter, operating with polarization encoded attenuated pulses. We report on measurements of all degrees of freedom of the transmitted photons in order to estimate potential side channels of the state preparation at Alice.


PACS

03.67.Dd Quantum cryptography and communication security

Subjects

Computational physics

Quantum information and quantum mechanics

Dates

Issue 6 (June 2009)

Received 12 December 2008

Published 3 June 2009



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