A germanium hole spin qubit Journal Article

Author(s): Watzinger, Hannes; Kukučka, Josip; Vukušić, Lada; Gao, Fei; Wang, Ting; Schäffler, Friedrich; Zhang, Jian-Jun; Katsaros, Georgios
Article Title: A germanium hole spin qubit
Affiliation IST Austria
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.
Journal Title: Nature Communications
Volume: 9
Issue 3902
ISSN: 2041-1723
Publisher: Nature Publishing Group  
Date Published: 2018-09-25
Start Page: Article number: 3902 (2018)
Copyright Statement: CC BY 4.0
Sponsor: ERC Starting Grant No. 335497, FWF-Y 715-N30 project, National Key R&D Program of China (Grant No. 2016YFA0301701), NSFC (Grants No. 11574356 and 11434010)
DOI: 10.1038/s41467-018-06418-4
Open access: yes (OA journal)