Quantum teleportation between two mesoscopic objects: a photonic pulse and an atomic ensemble

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Abstract
Quantum teleportation is one of the main paradigms in quantum information science. It is an important ingredient in distributed quantum networks, and can also serve as an elementary operation in quantum computers. In this paper we demonstrate for the first time quantum teleportation between two objects of different nature: a pulse of light and a material object. A quantum state encoded in a mesoscopic light pulse is teleported onto an atomic ensemble containing 10^12 Cesium atoms. The teleportation is performed at a distance of 0.5m, and this distance can be increased limited primarily by losses in the transmission of the light. The teleportation is deterministic, with a fidelity of 0.58+-0.02 for coherent states with a mean photon number of 20 and a fidelity of 0.61+-0.02 for states with 5 photons - significantly higher than any classical state transfer can possibly achieve. Quantum teleportation between the carrier of information - light - and the storage and processing medium - atoms - is a new step towards distributed quantum networks.

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