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Conference on Lasers and Electro-Optics

Sequential quantum teleportation for continuous variables and quantum state reconstruction by optical homodyne tomography

Hidehiro Yonezawa, Akira Furusawa

Published Jan 1, 2006• 0 citations
Publisher

Abstract

Sequential quantum teleportation for continuous variables is experimentally demonstrated. By using two high fidelity teleporters, an unknown coherent state is teleported twice and fidelity is F = 0.53±0.2.We show the measurement results using optical homodyne tomography.
DOI
10.1109/cleo.2006.4628888

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We demonstrate a sequence of two quantum teleportations of optical coherent states, combining two high-fidelity teleporters for continuous variables. In our experiment, the individual teleportation fidelities are evaluated as ${F}_{1}=0.70\ifmmode\pm\else\textpm\fi{}0.02$ and ${F}_{2}=0.75\ifmmode\pm\else\textpm\fi{}0.02$, while the fidelity between the input and the sequentially teleported states is determined as ${F}^{(2)}=0.57\ifmmode\pm\else\textpm\fi{}0.02$. This still exceeds the optimal fidelity of one half for classical teleportation of arbitrary coherent states and almost attains the value of the first (unsequential) quantum teleportation experiment with optical coherent states.
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.
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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.