China's Findings in Top Ten Physics Developments :Experimental realization of freely propagating teleported qubits

The Top Ten Evolutions in 2003 World Physics unveiled recently by the European Physical Society has listed the paper on experimental realization of freely propagating teleported qubits by Prof. Pan Jianwei of the Chinese University of Science and Technology.

Prof. Pan and his colleagues had found in the study that qubits could be successfully propagated without violating the propagating condition if the luminance of qubits was duly reduced. It is believed that the finding, if combined with other techniques, may not only find the fundamental solution to the technical difficulty encountered in the current long distance quanta telecommunication, but will also greatly stimulate the experimental study of quanta computation.

Experimental realization of freely propagating teleported qubits

Nature 421, 721-725 (13 February 2003) | doi:10.1038/nature01412;

Quantum-mechanical entanglement of three or four particles has been achieved experimentally, and has been used to demonstrate the extreme contradiction between quantum mechanics and local realism. However, the realization of five-particle entanglement remains an experimental challenge. The ability to manipulate the entanglement of five or more particles is required for universal quantum error correction. Another key process in distributed quantum information processing, similar to encoding and decoding, is a teleportation protocol that we term 'open-destination' teleportation. An unknown quantum state of a single particle is teleported onto a superposition of N particles; at a later stage, this teleported state can be read out (for further applications) at any of the N particles, by a projection measurement on the remaining particles. Here we report a proof-of-principle demonstration of five-photon entanglement and open-destination teleportation (for N = 3). In the experiment, we use two entangled photon pairs to generate a four-photon entangled state, which is then combined with a single-photon state. Our experimental methods can be used for investigations of measurement-based quantum computation and multi-party quantum communication.

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