Berlin 2014 – wissenschaftliches Programm
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SYQR: Symposium Quantum Repeater
SYQR 3: Quantum Protocols and Gates
SYQR 3.6: Vortrag
Dienstag, 18. März 2014, 11:45–12:00, Kinosaal
Harnessing the diamond spin bath — Jan Honert1, Martin Hohmann1, Nan Zhao2, •Helmut Fedder1, and Jörg Wrachtrup1 — 13. Physikalisches Institut and Research Center SCoPE, University Stuttgart, Germany — 2Beijing Computational Science Research Center, Beijing, China
13C nuclear spins in diamond are the predominant source of decoherence for
electron spin qubits such as the NV center [1] or ST1 [2] defect. At the
same time, they are a valuable resource for the implementation of nuclear spin
quantum registers [3]. Addressing distant and thus weakly coupled bath spins would enable us to scale up nuclear spin registers to sizes relevant
to small scale quantum algorithms such as stabilizer codes that are particularly relevant to quantum repeaters. In here we show
that dynamical decoupling techniques can be used to detect a single 13C nuclear
spin that is coupled to an NV center with a dipole coupling strength as weak as
400 Hz. We discuss protocols for initializing and coherently controlling such
weakly coupled bath spins.
[1] P. Neumann et al. Multipartite entanglement among single spins in
diamond. Science 320, 1326 (2008)
[2] S.-Y. Lee et al. Readout and control of a single nuclear spin with a
metastable electron spin ancilla. Nature nano. 8, 487 (2013)
[3] G. Waldherr et al. Quantum error correction in a solid-state hybrid spin
register. arXiv:1309.6424v2 (2013).