Experimental characterization of Gaussian quantum-communication channels

Experimental characterization of Gaussian quantum-communication channels

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...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Vol. 76; no. 1
Main Authors: DiGuglielmo, James, Hage, Boris, Franzen, Alexander, Fiurášek, Jaromír, Schnabel, Roman
Format: Journal Article
Language:English
Published: United States 23-07-2007
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COMMUNICATIONS
EIGENSTATES
GAUSSIAN PROCESSES
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
QUANTUM TELEPORTATION
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Summary: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.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.76.012323