title: All-Optical Preparation of Coherent Dark States of a Single Rare Earth Ion Spin in a Crystal.
abstract: All-optical addressing and coherent control of single solid-state based quantum bits is a key tool for fast and precise control of ground-state spin qubits. So far, all-optical addressing of qubits was demonstrated only in a very few systems, such as color centers and quantum dots. Here, we perform high-resolution spectroscopic of native and implanted single rare earth ions in solid, namely, a cerium ion in yttrium aluminum garnet (YAG) crystal. We find narrow and spectrally stable optical transitions between the spin sublevels of the ground and excited optical states. Utilizing these transitions we demonstrate the generation of a coherent dark state in electron spin sublevels of a single Ce^{3+} ion in YAG by coherent population trapping.
authors.affiliation: 3. Physikalisches Institut, Universität Stuttgart, and Stuttgart Research Center of Photonic Engineering (SCoPE), Pfaffenwaldring 57, D-70569 Stuttgart, Germany.
authors.forename: Kangwei
authors.initials: K
authors.lastname: Xia
authors.affiliation: 3. Physikalisches Institut, Universität Stuttgart, and Stuttgart Research Center of Photonic Engineering (SCoPE), Pfaffenwaldring 57, D-70569 Stuttgart, Germany.
authors.forename: Roman
authors.initials: R
authors.lastname: Kolesov
authors.affiliation: 3. Physikalisches Institut, Universität Stuttgart, and Stuttgart Research Center of Photonic Engineering (SCoPE), Pfaffenwaldring 57, D-70569 Stuttgart, Germany.
authors.forename: Ya
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQst), Universität Ulm, Universität Ost, Raum N25, D-89081 Ulm, Germany.
authors.forename: Petr
authors.initials: P
authors.lastname: Siyushev
authors.affiliation: 3. Physikalisches Institut, Universität Stuttgart, and Stuttgart Research Center of Photonic Engineering (SCoPE), Pfaffenwaldring 57, D-70569 Stuttgart, Germany.
authors.forename: Rolf
authors.initials: R
authors.lastname: Reuter
authors.affiliation: 3. Physikalisches Institut, Universität Stuttgart, and Stuttgart Research Center of Photonic Engineering (SCoPE), Pfaffenwaldring 57, D-70569 Stuttgart, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Kornher
authors.affiliation: Ruhr-Universität Bochum, Universitätsstraße 150 Gebäude NB, D-44780 Bochum, Germany.
authors.forename: Nadezhda
authors.initials: N
authors.lastname: Kukharchyk
authors.affiliation: Ruhr-Universität Bochum, Universitätsstraße 150 Gebäude NB, D-44780 Bochum, Germany.
authors.forename: Andreas D
authors.initials: AD
authors.lastname: Wieck
authors.affiliation: 3. Physikalisches Institut, Universität Stuttgart, and Stuttgart Research Center of Photonic Engineering (SCoPE), Pfaffenwaldring 57, D-70569 Stuttgart, Germany.
authors.forename: Bruno
authors.initials: B
authors.lastname: Villa
authors.affiliation: 3. Physikalisches Institut, Universität Stuttgart, and Stuttgart Research Center of Photonic Engineering (SCoPE), Pfaffenwaldring 57, D-70569 Stuttgart, Germany.
authors.forename: Sen
authors.initials: S
authors.lastname: Yang
authors.affiliation: 3. Physikalisches Institut, Universität Stuttgart, and Stuttgart Research Center of Photonic Engineering (SCoPE), Pfaffenwaldring 57, D-70569 Stuttgart, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Wrachtrup