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Experimental characterization of Gaussian quantum-communication channels

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DiGuglielmo,  James
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Hage,  Boris
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Schnabel,  Roman
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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PRA76_012323.pdf
(Any fulltext), 791KB

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Citation

DiGuglielmo, J., Hage, B., Franzen, A., Fiurasek, J., & Schnabel, R. (2007). Experimental characterization of Gaussian quantum-communication channels. Physical Review. A, 76: 012323. doi:10.1103/PhysRevA.76.012323.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0012-9D4F-9
Abstract
We present a full experimental characterization of continuous-variable quantum-communication channels established by shared entanglement together with local operations and classical communication. The resulting teleportation channel was fully characterized by measuring all elements of the covariance matrix of the shared two-mode squeezed Gaussian state. From the experimental data we determined the lower bound to the quantum channel capacity, the teleportation fidelity of coherent states, and the logarithmic negativity and purity of the shared state. Additionally, a positive secret key rate was obtained for two of the established channels.