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Quantum teleportation from a telecom-wavelength photon to a solid-state quantum memory


Quantum teleportation1 is a cornerstone of quantum information science due to its essential role in important tasks such as the long-distance transmission of quantum information using quantum repeaters2,3. This requires the efficient distribution of entanglement between remote nodes of a network4. Here, we demonstrate quantum teleportation of the polarization state of a telecom-wavelength photon onto the state of a solid-state quantum memory. Entanglement is established between a rare-earth-ion-doped crystal storing a single photon that is polarization-entangled with a flying telecom-wavelength photon5,6. The latter is jointly measured with another flying polarization qubit to be teleported, which heralds the teleportation. The fidelity of the qubit retrieved from the memory is shown to be greater than the maximum fidelity achievable without entanglement, even when the combined distances travelled by the two flying qubits is 25 km of standard optical fibre. Our results demonstrate the possibility of long-distance quantum networks with solid-state resources.

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Figure 1: Experimental set-up.
Figure 2: Experimental results.


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The authors thank R. Thew, P. Sekatski and H. Zbinden for discussions. The authors acknowledge support by the European project QuReP and the Swiss National Centre of Competence in Research ‘Quantum Science and Technology’ (NCCR QSIT). Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.

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The experiment was conceived by F.B., C.C., M.A. and N.G. The superconducting detectors were fabricated by V.B.V., S.W.N. and F.M. and characterized by V.B.V., B.K. and F.B. The rare-earth-ion doped crystals were grown by A.F. and P.G. and characterized by A.T. and F.B. The lithium niobate waveguide was fabricated by H.H., C.S. and W.S. and characterized by C.C. The measurements and data analysis were done by C.C., A.T. and F.B. The manuscript was written by F.B., A.T. and C.C., with contributions from all authors.

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Correspondence to Félix Bussières.

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The authors declare no competing financial interests.

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Bussières, F., Clausen, C., Tiranov, A. et al. Quantum teleportation from a telecom-wavelength photon to a solid-state quantum memory. Nature Photon 8, 775–778 (2014).

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