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Phys Rev Lett. 2004 Apr 23;92(16):167903. Epub 2004 Apr 23.

Triggered qutrits for quantum communication protocols.

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  • 1Institut für Experimentalphysik, Universität Wien, Boltzmanngasse, 5, A-1090 Vienna, Austria.


A general protocol in quantum information and communication relies in the ability of producing, transmitting, and reconstructing, in general, qunits. In this Letter we show for the first time the experimental implementation of these three basic steps on a pure state in a three-dimensional space, by means of the orbital angular momentum of the photons. The reconstruction of the qutrit is performed with tomographic techniques and a maximum-likelihood estimation method. For the tomographic reconstruction we used more than 2400 different projections. In this way we also demonstrate that we can perform any transformation in the three-dimensional space.

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