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Nat Commun. 2014 May 14;5:3895. doi: 10.1038/ncomms4895.

Coherent properties of single rare-earth spin qubits.

Author information

  • 11] 3. Physikalisches Institut, Universität Stuttgart and Stuttgart Research Center of Photonic Engineering (SCoPE), Pfaffenwaldring 57, Stuttgart D-70569, Germany [2].
  • 23. Physikalisches Institut, Universität Stuttgart and Stuttgart Research Center of Photonic Engineering (SCoPE), Pfaffenwaldring 57, Stuttgart D-70569, Germany.
  • 3Beijing Computational Science Research Center, Beijing 100084, China.
  • 4Institute of Applied Physics and Computational Mathematics, PO Box 8009 (28), Beijing 100088, China.
  • 5Hefei National Laboratory for Physics Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China.
  • 6Ruhr-Universität Bochum, Universitätsstraß e 150 Gebäude NB, Bochum D-44780, Germany.

Abstract

Rare-earth-doped crystals are excellent hardware for quantum storage of photons. Additional functionality of these materials is added by their waveguiding properties allowing for on-chip photonic networks. However, detection and coherent properties of rare-earth single-spin qubits have not been demonstrated so far. Here we present experimental results on high-fidelity optical initialization, efficient coherent manipulation and optical readout of a single-electron spin of Ce(3+) ion in a yttrium aluminium garnet crystal. Under dynamic decoupling, spin coherence lifetime reaches T2 = 2 ms and is almost limited by the measured spin-lattice relaxation time T1 = 4.5 ms. Strong hyperfine coupling to aluminium nuclear spins suggests that cerium electron spins can be exploited as an interface between photons and long-lived nuclear spin memory. Combined with high brightness of Ce(3+) emission and a possibility of creating photonic circuits out of the host material, this makes cerium spins an interesting option for integrated quantum photonics.

PMID:
24826968
[PubMed]
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