Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Quantum information: Atoms and ions II
Q 13.7: Talk
Monday, March 17, 2014, 15:45–16:00, UDL HS3038
Coherent manipulation of a single-spin rare-earth qubit in a crystal — •Roman Kolesov1, Petr Siyushev1, Kangwei Xia1, Rolf Reuter1, Mohammad Jamali1, Nan Zhao2, Ning Yang3, Changkui Duan4, Nadezhda Kukharchyk5, Andreas Wieck5, and Jörg Wrachtrup1 — 1Universität Stuttgart, Pfaffenwaldring 57, 70182 Stuttgart, Germany — 2Beijing Computational Science Research Center, Beijing 100084, China — 3Institute of Applied Physics and Computational Mathematics, P.O. Box 8009(28), 100088 Beijing, China — 4University of Science and Technology of China, Hefei, 230026, China — 5Ruhr-Universität Bochum, Universitätsstraße 150, Gebäude NB, D-44780 Bochum, Germany
Rare-earth doped crystals are known to be excellent spin memories for quantum information storage. However, inability to address individual spins makes these materials hard to implement for quantum information processing. We report on efficient optical initialization, coherent manipulation, and subsequent readout of the coherent state of a single electron spin of a cerium dopant ion in yttrium aluminium garnet. The initialization step is accomplished by polarization selective optical pumping while coherent manipulations of the electron spin are performed by means of microwaves resonant with the spin transition. Rigorous studies ofthe coherence properties of cerium spin showed that while the spin-lattice relaxation time is 3.8ms, the decoherence time is only 240ns. By means of efficient dynamic decoupling of the cerium spin from the surrounding nuclear spin environment, the lifetime of cerium spin coheremce is extended 4 orders of magnitude to 2ms.