title: Electron spin manipulation and readout through an optical fiber.
abstract: The electron spin of nitrogen--vacancy (NV) centers in diamond offers a solid-state quantum bit and enables high-precision magnetic-field sensing on the nanoscale. Implementation of these approaches in a fiber format would offer unique opportunities for a broad range of technologies ranging from quantum information to neuroscience and bioimaging. Here, we demonstrate an ultracompact fiber-optic probe where a diamond microcrystal with a well-defined orientation of spin quantization NV axes is attached to the fiber tip, allowing the electron spins of NV centers to be manipulated, polarized, and read out through a fiber-optic waveguide integrated with a two-wire microwave transmission line. The microwave field transmitted through this line is used to manipulate the orientation of electron spins in NV centers through the electron-spin resonance tuned by an external magnetic field. The electron spin is then optically initialized and read out, with the initializing laser radiation and the photoluminescence spin-readout return from NV centers delivered by the same optical fiber.
authors.affiliation: 1] Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia [2] Russian Quantum Center, ul. Novaya 100, Skolkovo, Moscow Region, 1430125 Russia.
authors.forename: I V
authors.initials: IV
authors.lastname: Fedotov
authors.affiliation: 1] Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia [2] Russian Quantum Center, ul. Novaya 100, Skolkovo, Moscow Region, 1430125 Russia [3] Department of Neuroscience, Kurchatov Institute National Research Center, Moscow, Russia.
authors.forename: L V
authors.initials: LV
authors.lastname: Doronina-Amitonova
authors.affiliation: 1] Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia [2] Russian Quantum Center, ul. Novaya 100, Skolkovo, Moscow Region, 1430125 Russia.
authors.forename: A A
authors.initials: AA
authors.lastname: Voronin
authors.affiliation: P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky pr. 53, Moscow 119991, Russia.
authors.forename: A O
authors.initials: AO
authors.lastname: Levchenko
authors.affiliation: P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky pr. 53, Moscow 119991, Russia.
authors.forename: S A
authors.initials: SA
authors.lastname: Zibrov
authors.affiliation: 1] Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia [2] Russian Quantum Center, ul. Novaya 100, Skolkovo, Moscow Region, 1430125 Russia.
authors.forename: D A
authors.initials: DA
authors.lastname: Sidorov-Biryukov
authors.affiliation: 1] Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia [2] Russian Quantum Center, ul. Novaya 100, Skolkovo, Moscow Region, 1430125 Russia.
authors.forename: A B
authors.initials: AB
authors.lastname: Fedotov
authors.affiliation: P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky pr. 53, Moscow 119991, Russia.
authors.forename: V L
authors.initials: VL
authors.lastname: Velichansky
authors.affiliation: 1] Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia [2] Russian Quantum Center, ul. Novaya 100, Skolkovo, Moscow Region, 1430125 Russia [3] Department of Physics and Astronomy, Texas A&M University, College Station TX 77843, USA.
authors.forename: A M
authors.initials: AM
authors.lastname: Zheltikov