Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 33: Quantum Information: Solid State Systems II

Q 33.3: Vortrag

Mittwoch, 8. März 2017, 15:00–15:15, P 3

Optical coherence in 1.53 um Erbium transition in ⁷LiYF₄ crystal below 1K — •Nadezhda Kukharchyk¹, Dmitriy Sholokhov¹, Stella L. Korableva², Alexey A. Kalachev³, and Pavel Bushev¹ — ¹Experimentalphysik, Universität des saarlandes, D-66123 Saarbrücken, Germany — ²Kazan Federal University, 420008 Kazan, Russian Federation — ³Kazan Institute of Physics and Technology, 420029 Kazan, Russian Federation

Rare earth doped materials find nowadays many applications in various industrial and research fields. When put into wide band gap crystals, rare earths exhibit long optical and microwave coherence times, which is in a great interest for quantum information processing. In current work, we have studied Erbium monoisotopic LiYF₄ crystals. Such isotopically pure crystals have very low optical inhomogeneous broadening of approx. 10 MHz; This opens many possibilities to implement these crystals as off-resonant Raman quantum memory or as frequency converter. Here, we demonstrate dependencies of coherence times of ¹⁶⁶Er in ⁷LiYF₄ on magnetic field and on temperature. Several crucial effects were observed: “frozen core” and ZEFOZ, which allowed to reach optical coherence times up to 75 us at magnetic field of 200 mT.