Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 62: Quantum Information: Quantum Computing and Communication III
Q 62.3: Talk
Friday, March 4, 2016, 11:30–11:45, e214
Atmospheric Quantum Key Distribution with Squeezed States — •Kevin Günthner1, Christian Peuntinger1, Christian S. Jacobsen2, Dominique Elser1, Vladyslav C. Usenko3, Radim Filip3, Ulrik L. Andersen2, Christoph Marquardt1, and Gerd Leuchs1 — 1Max Planck Institute for the Science of Light (MPL), Erlangen, Germany and Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) — 2Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark — 3Department of Optics, Palacký University, Olomouc, Czech Republic
In Continuous Variable Quantum Key Distribution, Gaussian quantum states and homodyne detection are used to distribute a secret key between two parties.
Recently it was shown that — in comparison to coherent states — squeezed states can provide higher key rates in presence of channel noise and realistic reconciliation efficiency [1].
This protocol was already successfully implemented in laboratory conditions [2]. Now we verify the feasibility of this approach with an urban free-space channel. We eliminate atmospheric phase noise by using polarization squeezed states benefiting from a decoherence free subspace [3].
[1] V. C. Usenko and R. Filip, New J. Phys. 13, 113007 (2011).
[2] C. S. Jacobsen et al., arXiv:1408.4566 (2014).
[3] C. Peuntinger et al., Phys. Rev. Lett. 113, 060502 (2014).