Abstract
Quantum teleportation is a key ingredient in quantum networks1,2 and one of the building blocks for quantum computation3,4. Teleportation between distant material objects using light as the quantum-information carrier has been a particularly exciting goal. Here we propose and demonstrate the deterministic continuous-variable teleportation between distant material objects. The objects are macroscopic atomic ensembles at room temperature. Entanglement required for teleportation is distributed by light propagating from one ensemble to the other. We demonstrate that the experimental fidelity of the quantum teleportation is higher than that achievable by any classical process. Furthermore, we demonstrate the benefits of deterministic teleportation by teleporting a sequence of spin states evolving in time from one distant object onto another. The teleportation protocol is applicable to other important systems, such as mechanical oscillators coupled to light or cold spin ensembles coupled to microwaves.
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Acknowledgements
We gratefully acknowledge discussions with J. I. Cirac, K. Hammerer and D. V. Vasilyev. This work was supported by the ERC grants INTERFACE and QUAGATUA, the Danish National Science Foundation Center QUANTOP, the DARPA programme QUASAR, the Alexander von Humboldt Foundation, TOQATA (FIS2008-00784) and the EU projects QESSENCE, MALICIA and AQUTE.
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H.K., D.S., J.M.P., H.S. and T.F. performed the experiment. The theoretical model was developed by C.A.M. H.K, C.A.M., D.S. and E.S.P. wrote the paper. E.S.P. supervised the project.
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Krauter, H., Salart, D., Muschik, C. et al. Deterministic quantum teleportation between distant atomic objects. Nature Phys 9, 400–404 (2013). https://doi.org/10.1038/nphys2631
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DOI: https://doi.org/10.1038/nphys2631
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