Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 9: Quantum Information: Quantum Computation I

Q 9.3: Vortrag

Montag, 23. März 2015, 15:15–15:30, B/gHS

Improvement of hybrid solid state spin systems for quantum information processing — •Nabeel Aslam, Matthias Pfender, Sebastian Zaiser, Philipp Neumann, and Jörg Wrachtrup — 3. Physikalisches Institut, Universität Stuttgart, Deutschland

Individual electron and nuclear spins in solids (e.g. phosphorus in silicon [1] or nitrogen-vacancy (NV) centers in diamond) are considered as candidates for the implementation of quantum information processing. For fault-tolerance, error correction is required. For example, the electron spin of the NV center and coupled nuclear spins form a logical qubit, for which phase flip error correction was implemented [2]. For more sophisticated quantum error correction codes the number of applicable nuclear spins as well as their coherence properties need to be enhanced. Both parameters are improved with the application of high magnetic fields. Correspondingly, methods for manipulation and readout of the whole spin register up to E-band frequencies (60-90 GHz) are introduced. First experimental results including T1 lifetimes of single nuclear spins exceeding several minutes are shown. The electron spin T1 lifetime limits the coherence time (T2) of nuclear spins. Methods to overcome this limit are discussed and first implementations are demonstrated.

[1] Muhonen, Juha T., et al., Nature Nanotechnology (2014). [2] Waldherr, G., et al., Nature 506, 204 (2014).