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In quantum teleportation, the state of a single quantum system is disembodiedinto classical information and purely quantum correlations, to be laterreconstructed onto a second system that has never directly interacted with thefirst one. This counterintuitive phenomenon is a cornerstone of quantuminformation science due to its essential role in several important tasks suchas the long-distance transmission of quantum information using quantumrepeaters. In this context, a challenge of paramount importance is thedistribution of entanglement between remote nodes, and to use this entanglementas a resource for long-distance light-to-matter quantum teleportation. Here wedemonstrate quantum teleportation of the polarization state of atelecom-wavelength photon onto the state of a solid-state quantum memory.Entanglement is established between a rare-earth-ion doped crystal storing asingle photon that is polarization-entangled with a flying telecom-wavelengthphoton. The latter is jointly measured with another flying qubit carrying thepolarization state to be teleported, which heralds the teleportation. Thefidelity of the polarization state of the photon retrieved from the memory isshown to be greater than the maximum fidelity achievable without entanglement,even when the combined distances travelled by the two flying qubits is 25 km ofstandard optical fibre. This light-to-matter teleportation channel paves theway towards long-distance implementations of quantum networks with solid-statequantum memories.

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