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We report on the quantum storage and retrieval of photonic polarizationquantum bits onto and out of a solid state storage device. The qubits areimplemented with weak coherent states at the single photon level, and arestored for 500 ns in a praseodymium doped crystal with a storage and retrievalefficiency of 10%, using the atomic frequency comb scheme. We characterize thestorage by using quantum state tomography, and find that the averageconditional fidelity of the retrieved qubits exceeds 95% for a mean photonnumber mu=0.4. This is significantly higher than a classical benchmark, takinginto account the Poissonian statistics and finite memory efficiency, whichproves that our device functions as a quantum storage device for polarizationqubits, even if tested with weak coherent states. These results extend thestorage capabilities of solid state quantum memories to polarization encoding,which is widely used in quantum information science.

Quantum Storage of a Photonic Polarization Qubit in a Solid