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Dynamics of Hole Singlet-Triplet Qubits with Large g-Factor Differences
Daniel Jirovec1, Philipp M Mutter2, Andrea Hofmann1,3
1Institute of Science and Technology Austria (ISTA), Am Campus 1, 3400 Klosterneuburg, Austria.
Physical Review Letters
|April 8, 2022
Summary
We explored the cubic Rashba spin-orbit interaction in germanium (Ge) hole double quantum dots. This interaction enables fast electrical control of spin qubits, crucial for advancing quantum computing technologies.
Area of Science:
- Quantum Computing
- Spintronics
- Condensed Matter Physics
Background:
- Spin-orbit interaction is key for electrical control of spin qubits.
- Hole spin qubits exhibit strong spin-orbit interaction, enabling fast manipulation.
- A detailed understanding of this interaction in hole systems is currently lacking.
Purpose of the Study:
- To experimentally and theoretically investigate the cubic Rashba spin-orbit interaction's effect on spin state mixing.
- To analyze singlet-triplet oscillations in a planar Germanium (Ge) hole double quantum dot.
Main Methods:
- Utilizing Landau-Zener sweeps across various magnetic field directions.
- Disentangling spin-orbit induced spin-flip terms from anisotropic quantum dot g-tensors.
- Combining experimental measurements with theoretical analysis.
Main Results:
- Quantified the impact of cubic Rashba spin-orbit interaction on spin state mixing.
- Successfully differentiated spin-orbit effects from g-tensor contributions.
- Provided experimental evidence for the significant role of spin-orbit interaction in Ge hole qubits.
Conclusions:
- The study offers crucial new insights into hole spin-orbit interaction.
- Findings are essential for optimizing spin qubit manipulation in future quantum computing experiments.
- Highlights the potential of Ge hole systems for fast, all-electrical qubit control.
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