A singlet-triplet hole spin qubit in planar Ge

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2021
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Jirovec, Daniel
Hofmann, Andrea
Ballabio, Andrea
Tavani, Giulio
Botifoll, Marc
Crippa, Alessandro
Kukucka, Josip
Sagi, Oliver
Katsaros, Georgios
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Nature materials. Springer Nature. 2021, 20(8), pp. 1106-1112. ISSN 1476-1122. eISSN 1476-4660. Available under: doi: 10.1038/s41563-021-01022-2
Zusammenfassung

Spin qubits are considered to be among the most promising candidates for building a quantum processor. Group IV hole spin qubits are particularly interesting owing to their ease of operation and compatibility with Si technology. In addition, Ge offers the option for monolithic superconductor-semiconductor integration. Here, we demonstrate a hole spin qubit operating at fields below 10 mT, the critical field of Al, by exploiting the large out-of-plane hole g-factors in planar Ge and by encoding the qubit into the singlet-triplet states of a double quantum dot. We observe electrically controlled g-factor difference-driven and exchange-driven rotations with tunable frequencies exceeding 100 MHz and dephasing times of 1 μs, which we extend beyond 150 μs using echo techniques. These results demonstrate that Ge hole singlet-triplet qubits are competing with state-of-the-art GaAs and Si singlet-triplet qubits. In addition, their rotation frequencies and coherence are comparable with those of Ge single spin qubits, but singlet-triplet qubits can be operated at much lower fields, emphasizing their potential for on-chip integration with superconducting technologies.

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ISO 690JIROVEC, Daniel, Andrea HOFMANN, Andrea BALLABIO, Philipp M. MUTTER, Giulio TAVANI, Marc BOTIFOLL, Alessandro CRIPPA, Josip KUKUCKA, Oliver SAGI, Georgios KATSAROS, 2021. A singlet-triplet hole spin qubit in planar Ge. In: Nature materials. Springer Nature. 2021, 20(8), pp. 1106-1112. ISSN 1476-1122. eISSN 1476-4660. Available under: doi: 10.1038/s41563-021-01022-2
BibTex
@article{Jirovec2021-08singl-54092,
  year={2021},
  doi={10.1038/s41563-021-01022-2},
  title={A singlet-triplet hole spin qubit in planar Ge},
  number={8},
  volume={20},
  issn={1476-1122},
  journal={Nature materials},
  pages={1106--1112},
  author={Jirovec, Daniel and Hofmann, Andrea and Ballabio, Andrea and Mutter, Philipp M. and Tavani, Giulio and Botifoll, Marc and Crippa, Alessandro and Kukucka, Josip and Sagi, Oliver and Katsaros, Georgios}
}
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