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Role of the electron spin in determining the coherence of the nuclear spins in a quantum dot

Wüst, G. and Munsch, M. and Maier, F. and Kuhlmann, A. V. and Ludwig, A. and Wieck, A. D. and Loss, D. and Poggio, M. and Warburton, R. J.. (2016) Role of the electron spin in determining the coherence of the nuclear spins in a quantum dot. Nature Nanotechnology, 11. pp. 885-889.

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Abstract

A huge effort is underway to develop semiconductor nanostructures as low-noise qubits. A key source of dephasing for an electron spin qubit in GaAs and in naturally occurring Si is the nuclear spin bath. The electron spin is coupled to each nuclear spin by the hyperfine interaction. The same interaction also couples two remote nuclear spins via a common coupling to the delocalized electron. It has been suggested that this interaction limits both electron and nuclear spin coherence, but experimental proof is lacking. We show that the nuclear spin decoherence time decreases by two orders of magnitude on occupying an empty quantum dot with a single electron, recovering to its original value for two electrons. In the case of one electron, agreement with a model calculation verifies the hypothesis of an electron-mediated nuclear spin–nuclear spin coupling. The results establish a framework to understand the main features of this complex interaction in semiconductor nanostructures.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Physics (Warburton)
05 Faculty of Science > Departement Physik > Physik > Nanotechnologie Argovia (Poggio)
05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Poggio, Martino and Wüst, Gunter Johannes and Munsch, Mathieu and Maier, Franziska and Kuhlmann, Andreas and Ludwig, Arne and Loss, Daniel and Warburton, Richard J
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
ISSN:1748-3387
e-ISSN:1748-3395
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:27 Jul 2018 13:19
Deposited On:17 Oct 2016 07:45

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