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Conference on Lasers and Electro-Optics

Experimental realization of quantum teleportation network

Hidehiro Yonezawa, Takao Aoki, Akira Furusawa

Published Jan 1, 2004• 0 citations
Publisher

Abstract

A quantum teleportation network for continuous variables is experimentally demonstrated. Using a tripartite entangled state generated by three independent squeezed vacuum states, we exchange coherent states of electromagnetic fields among three parties.
DOI
10.1364/iqec.2004.ituj2

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We experimentally demonstrate quantum teleportation for continuous variables by using squeezed-state entanglement. A fidelity expression for a real experimental system is presented, where all the imperfection factors are considered, including losses and phase fluctuations. The measured fidelity for input coherent states is 0.62 and the prospective result with our measured entanglement and efficiencies is 0.69. We will show the details of the quantum teleportation for continuous variable and discuss the problems for further improvement in this experiment.
We experimentally demonstrate quantum teleportation for continuous variables using squeezed-state entanglement. The teleportation fidelity for a real experimental system is calculated explicitly, including relevant imperfection factors such as propagation losses, detection inefficiencies, and phase fluctuations. The inferred fidelity for input coherent states is $F=0.61\ifmmode\pm\else\textpm\fi{}0.02,$ which when corrected for the efficiency of detection by the output observer, gives a fidelity of 0.62.0.62.0.62. By contrast, the projected result based on the independently measured entanglement and efficiencies is 0.69.0.69.0.69. The teleportation protocol is explained in detail, including a discussion on discrepancy between experiment and theory, as well as on the limitations of the current apparatus.