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Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 17: Quantum Protocols and Gates SYQR 3 (with Q)

A 17.3: Talk

Tuesday, March 18, 2014, 11:00–11:15, Kinosaal

Quantum error correction in a solid-state hybrid spin registerGerald Waldherr1, Ya Wang1, •Sebastian Zaiser1, Mohammed Jamali1, Thomas Schulte-Herbrueggen2, Hiroshi Abe3, Takeshi Ohshima3, Junichi Isoya4, Philipp Neumann1, and Joerg Wrachtrup113. Physikalisches Institut , University of Stuttgart — 2Department of Chemistry, Technical University of Munich — 3Japan Atomic Energy Agency, Takasaki — 4Research Center for Knowledge Communities, University of Tsukuba, Tsukuba

Electron spins associated with solid state defects are promising systems for quantum information processing. Exploiting nuclear spins surrounding the defect as a quantum register provides a natural hybrid spin system. Such a system could be used for a fault-tolerant quantum repeater scheme [1] where the spins might be associated to nitrogen-vacancy (NV) centers in diamond. Here, we present a hybrid spin register based on a single NV defect in diamond coupled to three nuclear spins. The electron spin is used for control, and the nuclear spins as a long-lived quantum storage. We achieve high-fidelity initialization and single shot readout of the nuclear spin register. Implementation of a novel non-local gate combined with optimal control enables universal, high-fidelity control. With these techniques, we demonstrate three-qubit entanglement and quantum error correction. These experiments demonstrate the potential of solid state spin systems for quantum computation and communication. [1] L. Childress, et al., Phys. Rev. Lett. 96, 070504 (2006).

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