TY - JOUR

T1 - Continuous variable quantum key distribution with modulated entangled states.

A1 - Madsen,Lars S

A1 - Usenko,Vladyslav C.

A1 - Lassen,Mikael

A1 - Filip,Radim

A1 - Andersen,Ulrik L

AU - Madsen,Lars S

AU - Usenko,Vladyslav C.

AU - Lassen,Mikael

AU - Filip,Radim

AU - Andersen,Ulrik L

PB - Nature Publishing Group

PY - 2012

Y1 - 2012

N2 - Quantum key distribution enables two remote parties to grow a shared key, which they can use for unconditionally secure communication over a certain distance. The maximal distance depends on the loss and the excess noise of the connecting quantum channel. Several quantum key distribution schemes based on coherent states and continuous variable measurements are resilient to high loss in the channel, but are strongly affected by small amounts of channel excess noise. Here we propose and experimentally address a continuous variable quantum key distribution protocol that uses modulated fragile entangled states of light to greatly enhance the robustness to channel noise. We experimentally demonstrate that the resulting quantum key distribution protocol can tolerate more noise than the benchmark set by the ideal continuous variable coherent state protocol. Our scheme represents a very promising avenue for extending the distance for which secure communication is possible.

AB - Quantum key distribution enables two remote parties to grow a shared key, which they can use for unconditionally secure communication over a certain distance. The maximal distance depends on the loss and the excess noise of the connecting quantum channel. Several quantum key distribution schemes based on coherent states and continuous variable measurements are resilient to high loss in the channel, but are strongly affected by small amounts of channel excess noise. Here we propose and experimentally address a continuous variable quantum key distribution protocol that uses modulated fragile entangled states of light to greatly enhance the robustness to channel noise. We experimentally demonstrate that the resulting quantum key distribution protocol can tolerate more noise than the benchmark set by the ideal continuous variable coherent state protocol. Our scheme represents a very promising avenue for extending the distance for which secure communication is possible.

U2 - 10.1038/ncomms2097

DO - 10.1038/ncomms2097

JO - Nature Communications

JF - Nature Communications

SN - 2041-1723

VL - 3

SP - 1083

ER -