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Hybrid Acousto-Optical Spin Control in Quantum Dots.
Mateusz Kuniej1, Paweł Machnikowski1, Michał Gawełczyk1
1Wrocław University of Science and Technology, Institute of Theoretical Physics, 50-370 Wrocław, Poland.
Physical Review Letters
|February 16, 2026
Summary
We developed a new method for controlling electron spins in semiconductor quantum dots using sound and light. This technique overcomes weak mechanical coupling, enabling efficient acoustic spin rotation for quantum hybrid systems.
Area of Science:
- Quantum Information Science
- Semiconductor Physics
- Acoustics
Background:
- Mechanical coupling to spins in semiconductors is inefficient.
- This limits the integration of quantum dots (QDs) into on-chip acoustically coupled quantum hybrid systems.
Purpose of the Study:
- To propose and validate a novel hybrid acousto-optical spin control method for semiconductor QDs.
- To enable efficient acoustic spin rotation and overcome limitations in current quantum hybrid systems.
Main Methods:
- Combining continuous-wave detuned optical coupling to a trion state with acoustic modulation.
- Utilizing optical fields to break spin conservation, allowing phonons to drive spin transitions at resonance with the Zeeman frequency.
Main Results:
- Demonstrated a hybrid method for acoustic spin rotation in QDs.
- Numerical simulations predict high spin rotation fidelity (99.9%) with feasible parameters (50 ns trion lifetime, 44 GHz Zeeman splitting).
- The method is compatible with pulse sequences mitigating quasistatic noise.
Conclusions:
- The proposed acousto-optical method effectively introduces acoustic spin control to QDs.
- This advancement facilitates acoustic QD spin state transfer and transduction between acoustic, optical, and microwave domains.
- Enables on-chip integration for diverse solid-state quantum systems.
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