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Berlin 2014 – scientific programme

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SYQR: Symposium Quantum Repeater

SYQR 3: Quantum Protocols and Gates

SYQR 3.6: Talk

Tuesday, March 18, 2014, 11:45–12:00, Kinosaal

Harnessing the diamond spin bathJan Honert1, Martin Hohmann1, Nan Zhao2, •Helmut Fedder1, and Jörg Wrachtrup113. 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).

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