A germanium hole spin qubit

Hannes Watzinger (), Josip Kukučka (), Lada Vukušić, Fei Gao, Ting Wang, Friedrich Schäffler, Jian-Jun Zhang and Georgios Katsaros
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Hannes Watzinger: Institute of Science and Technology Austria
Josip Kukučka: Institute of Science and Technology Austria
Lada Vukušić: Institute of Science and Technology Austria
Fei Gao: National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Ting Wang: National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Friedrich Schäffler: Johannes Kepler University, Institute of Semiconductor and Solid State Physics
Jian-Jun Zhang: National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Georgios Katsaros: Institute of Science and Technology Austria

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract Holes confined in quantum dots have gained considerable interest in the past few years due to their potential as spin qubits. Here we demonstrate two-axis control of a spin 3/2 qubit in natural Ge. The qubit is formed in a hut wire double quantum dot device. The Pauli spin blockade principle allowed us to demonstrate electric dipole spin resonance by applying a radio frequency electric field to one of the electrodes defining the double quantum dot. Coherent hole spin oscillations with Rabi frequencies reaching 140 MHz are demonstrated and dephasing times of 130 ns are measured. The reported results emphasize the potential of Ge as a platform for fast and electrically tunable hole spin qubit devices.

Date: 2018
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DOI: 10.1038/s41467-018-06418-4

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