Experimental realization of entangled qutrits for quantum communication

Authors:
R. Thew;A. Acín;H. Zbinden;N. Gisin
Affiliations:
University of Geneva, Geneva, Switzerland;University of Geneva, Geneva, Switzerland and Institut de Ciències Fotòniques, Barcelona, Spain;University of Geneva, Geneva, Switzerland;University of Geneva, Geneva, Switzerland
Venue:
Quantum Information & Computation
Year:
2004

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Abstract

We have experimentally realizerd a technique to generate, control and measure entan-gled qutrits, 3-dimensional quantum systems. This scheme uses spontaneous parametricdown converted photons and unbalanced 3-arm fiber optic interferometers in a schemeanalogous to the Franson interferometric arrangement for qubits. The results reveal asource capable of generating maximally entangled states with a net state fidelity F =0.985 ± 0.018, Further the control over the system reveals a high, net, 2-photon interfer-ence fringe visibility, V = 0.919 ± 0.026. This has all been done at telecom wavelengthsthus facilitating the advancement towards long distance higher dimensional quantumcommunication.