Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.190503
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Funding
- Swiss NCCR Quantum Photonics
- Science and Technology Cooperation Program Switzerland-Russia
- European project QuRep
- European project ERC-Qore
- Fond Quebecois de la Recherche sur la Nature et les Technologies
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Storage of quantum information encoded into heralded single photons is an essential constituent of long-distance quantum communication based on quantum repeaters and of optical quantum information processing. The storage of photonic polarization qubits is, however, difficult because many materials are birefringent and have polarization-dependent absorption. Here we present a simple scheme that eliminates these polarization effects, and we demonstrate it by storing heralded polarization qubits into a solid-state quantum memory. The quantum memory is implemented with a biaxial yttrium orthosilicate (Y2SiO5) crystal doped with rare-earth ions. Heralded single photons generated from a filtered spontaneous parametric down-conversion source are stored, and quantum state tomography of the retrieved polarization state reveals an average fidelity of 97.5 +/- 0.4%, which is significantly higher than what is achievable with a measure-and-prepare strategy.
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