Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 25: Nano-Optics I
Q 25.7: Vortrag
Dienstag, 1. März 2016, 16:00–16:15, f342
All-optical preparation of coherent dark states of a single rare earth ion spin in a crystal — •Kangwei Xia1, Roman Kolesov1, Petr Siyushev2, Rolf Reuter1, Thomas Kornher1, Andreas D. Wieck3, and Jörg Wrachtrup1 — 1Universität Stuttgart — 2Universität Ulm — 3Ruhr-Universität Bochum
Rare-earth-doped crystals are excellent hardware for quantum storage of optical information. In quantum memories the quantum state of a photon is stored in an ensemble of spins. This type of memory is an essential ingredient of quantum repeaters and quantum computing protocols based on linear optics. Despite progress made with ensembles of rare-earth ions, the detection and manipulation of individual ions is one of the ways to reach scalability of rare earth-based quantum devices. Here, we present high-fidelity optical initialization, coherent manipulation, and optical readout of a single electron spin of Ce ion in YAG. Under dynamic decoupling, spin coherence lifetime reaches 2ms. The generation of coherent dark state of a single Ce in YAG will be also present. The dark state was formed under the condition of coherent population trapping. In addition, high-resolution spectroscopic studies of single Ce ions have been performed. They revealed narrow and spectrally stable optical transitions between the spin sublevels of the ground and excited optical states, indicating the feasibility of interfacing single photons with a single electron spin of a cerium ion. Combined with high brightness of Ce3+ emission and a possibility of creating photonic circuits out of the host material, this makes cerium spins an interesting option for integrated quantum photonics.