Journal
PHYSICAL REVIEW A
Volume 88, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.88.022324
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Funding
- Swiss National Centres of Competence in Research (NCCR) project Quantum Science Technology (QSIT)
- European projects QuRep (FET Open STREP)
- CIPRIS (FP7 Marie Curie Actions)
- Q-Essence (FET Proactive Integrated Project)
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A long-lived quantum memory is a firm requirement for implementing a quantum repeater scheme. Recent progress in solid-state rare-earth-ion-doped systems justifies their status as very strong candidates for such systems. Nonetheless an optical memory based on spin-wave storage at the single-photon level has not been shown in such a system to date, which is crucial for achieving the long storage times required for quantum repeaters. In this paper we show that it is possible to execute a complete atomic frequency comb (AFC) scheme, including spin-wave storage, with weak coherent pulses of (n) over bar = 2.5 +/- 0.6 photons per pulse. We discuss in detail the experimental steps required to obtain this result and demonstrate the coherence of a stored time-bin pulse. We show a noise level of (7.1 +/- 2.3) x 10(-3) photons per mode during storage, and this relatively low noise level paves the way for future quantum optics experiments using spin waves in rare-earth-doped crystals.
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