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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).