We demonstrate an experimental realization of remote state preparation viathe quantum teleportation algorithm, using an entangled photon pair in thepolarization degree of freedom as the quantum resource. The input state isencoded on the path of one of the photons from the pair. The improvedexperimental scheme allows us to control the preparation and teleportation of astate over the entire Bloch sphere with a resolution of the degree of mixturegiven by the coherence length of the photon pair. Both the preparation of theinput state and the implementation of the quantum gates are performed in a pairof chained displaced Sagnac interferometers, which contribute to the overallrobustness of the setup. An average fidelity above 0.9 is obtained for theremote state preparation process. This scheme allows for a prepared state to betransmitted on every repetition of the experiment, thus giving an intrinsicsuccess probability of 1.
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