Decoupling a hole spin qubit from the nuclear spins

Prechtel, Jonathan H. and Kuhlmann, Andreas V. and Houel, Julien and Ludwig, Arne and Valentin, Sascha R. and Wieck, Andreas D. and Warburton, Richard J.. (2016) Decoupling a hole spin qubit from the nuclear spins. Nature Materials, 15 (9). pp. 981-986.

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Official URL: http://edoc.unibas.ch/52042/

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A huge effort is underway to develop semiconductor nanostructures as low-noise hosts for qubits. The main source of dephasing of an electron spin qubit in a GaAs-based system is the nuclear spin bath. A hole spin may circumvent the nuclear spin noise. In principle, the nuclear spins can be switched off for a pure heavy-hole spin. In practice, it is unknown to what extent this ideal limit can be achieved. A major hindrance is that p-type devices are often far too noisy. We investigate here a single hole spin in an InGaAs quantum dot embedded in a new generation of low-noise p-type device. We measure the hole Zeeman energy in a transverse magnetic field with 10 neV resolution by dark-state spectroscopy as we create a large transverse nuclear spin polarization. The hole hyperfine interaction is highly anisotropic: the transverse coupling is <1% of the longitudinal coupling. For unpolarized, randomly fluctuating nuclei, the ideal heavy-hole limit is achieved down to nanoelectronvolt energies; equivalently dephasing times up to a microsecond. The combination of large and strong optical dipole makes the single hole spin in a GaAs-based device an attractive quantum platform.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Physics (Warburton)
UniBasel Contributors:Warburton, Richard J and Prechtel, Jonathan Hans and Kuhlmann, Andreas and Houel, Julien
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:01 Mar 2017 12:00
Deposited On:01 Mar 2017 08:17

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