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Bichromatic Rabi Control of Semiconductor Qubits.
Valentin John1, Francesco Borsoi1, Zoltán György2
1QuTech and Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.
Physical Review Letters
|February 23, 2024
Summary
We show a new way to control quantum dot spin qubits using simultaneous microwave bursts. This method improves qubit addressability for larger quantum computing systems.
Area of Science:
- Quantum computing
- Semiconductor spintronics
- Quantum information science
Background:
- Electrically driven spin resonance is key for controlling semiconductor spin qubits.
- Challenges exist in qubit addressability and off-resonance driving for larger systems.
Purpose of the Study:
- To demonstrate a spatially selective method for controlling quantum dot hole spin qubits.
- To enable coherent bichromatic Rabi control for scalable qubit arrays.
Main Methods:
- Applying simultaneous microwave bursts to different gate electrodes.
- Utilizing quantum dot hole spin qubits.
- Developing a theoretical framework to explain experimental observations.
Main Results:
- Demonstrated coherent bichromatic Rabi control.
- Observed multichromatic resonance lines and resonance anticrossings due to ac Stark shift.
- Confirmed interdot motion as the dominant mechanism for bichromatic driving.
Conclusions:
- Coherent bichromatic Rabi control offers a spatially selective approach for large qubit arrays.
- The ac Stark shift plays a crucial role in bichromatic driving effects.
- Interdot motion is identified as the primary driver for this control mechanism.
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