期刊
PHYSICAL REVIEW LETTERS
卷 114, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.230501
关键词
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资金
- ERC
- Spanish Ministry of Economy and Competitiveness (MINECO)
- Fondo Europeo de Desarrollo Regional (FEDER) [FIS2012-37569]
- European project CHIST-ERA QScale
- People Programme (Marie Curie Actions) of the EU FP7 under REA Grant [287252]
- ICREA Funding Source: Custom
We demonstrate the first solid-state spin-wave optical quantum memory with on-demand read-out. Using the full atomic frequency comb scheme in a Pr3+:Y2SiO5 crystal, we store weak coherent pulses at the single-photon level with a signal-to-noise ratio > 10. Narrow-band spectral filtering based on spectral hole burning in a second Pr3+:Y2SiO5 crystal is used to filter out the excess noise created by control pulses to reach an unconditional noise level of (2.0 +/- 0.3) x 10(-3) photons per pulse. We also report spin-wave storage of photonic time-bin qubits with conditional fidelities higher than achievable by a measure and prepare strategy, demonstrating that the spin-wave memory operates in the quantum regime. This makes our device the first demonstration of a quantum memory for time-bin qubits, with on-demand read-out of the stored quantum information. These results represent an important step for the use of solid-state quantum memories in scalable quantum networks.
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