TY - JOUR
T1 - Complete elimination of information leakage in continuous-variable quantum communication channels
AU - Jacobsen, Christian S.
AU - Madsen, Lars S.
AU - Usenko, Vladyslav C.
AU - Fillip, Radim
AU - Andersen, Ulrik L.
PY - 2018
Y1 - 2018
N2 - In all lossy communication channels realized to date, information is inevitably leaked to a potential eavesdropper. Here we present a communication protocol that does not allow for any information leakage to a potential eavesdropper in a purely lossy channel. By encoding information into a restricted Gaussian alphabet of squeezed states we show, both theoretically and experimentally, that the Holevo information between the eavesdropper and the intended recipient can be exactly zero in a purely lossy channel while minimized in a noisy channel. This result is of fundamental interest, but might also have practical implications in extending the distance of secure quantum key distribution.
AB - In all lossy communication channels realized to date, information is inevitably leaked to a potential eavesdropper. Here we present a communication protocol that does not allow for any information leakage to a potential eavesdropper in a purely lossy channel. By encoding information into a restricted Gaussian alphabet of squeezed states we show, both theoretically and experimentally, that the Holevo information between the eavesdropper and the intended recipient can be exactly zero in a purely lossy channel while minimized in a noisy channel. This result is of fundamental interest, but might also have practical implications in extending the distance of secure quantum key distribution.
U2 - 10.1038/s41534-018-0084-0
DO - 10.1038/s41534-018-0084-0
M3 - Journal article
SN - 2056-6387
VL - 4
JO - n p j Quantum Information
JF - n p j Quantum Information
IS - 1
ER -