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13.01.2016

Prof. Dr. Tobias Gehring
Technical University Denmark, Lyngby


Organiser:
Max Planck Institute for the Science of Light
Gerd Leuchs

Title:
Measurement- and one-sided device-indepedendent quantum cryptography

Speaker:
Prof. Dr. Tobias Gehring
Technical University Denmark, Lyngby

Time, place:
Wednesday, January 13, 2016, 3:00 p.m.
Large seminar room (429/435), Bau 24, Guenther-Scharowsky-Str. 1

Abstract:
In quantum key distribution (QKD) an implementation has to follow the
assumptions made in a security proof to produce a secret key that cannot
be eavesdropped by exploiting side-channels. Common assumptions of
security proofs in continuous-variable QKD are among others that the
local oscillator has a not been tempered and that the homodyne detectors
are working properly,i.e. they are not saturated. Measurement-device
independent QKD relaxes the assumptions made on all involved detectors,
thereby bacically giving the detectors into the hand of an eavesdropper.
One-sided device independent QKD similarly removes
assumptions on the remote detector, but keeps some assumptions on a
local detector which is not accessible using the quantum channel. In
this talk I will present two proof-of-principle continuous-variable
experiments: An implementation of measurement-device-independent QKD
based on coherent states and an implementation of one-sided
device-independent QKD one based on Einstein-Podolsky-Rosen entangled
states.