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Counter-diabatic driving for fast spin control in a two-electron double quantum dot
1Department of Electronic Information Materials, Shanghai University, 200444 Shanghai, People's Republic of China.
Scientific Reports
|September 2, 2014
Summary
Shortcuts to adiabaticity accelerate quantum processes. This study uses counter-diabatic driving for fast spin manipulation in quantum dots, achieving high fidelity by avoiding decoherence.
Area of Science:
- Quantum physics
- Quantum information processing
Background:
- Adiabatic processes are crucial in quantum systems but are often slow.
- Shortcuts to adiabaticity techniques aim to speed up these processes.
- Applications include quantum information processing and quantum control.
Purpose of the Study:
- To investigate counter-diabatic driving for rapid adiabatic spin manipulation in a two-electron double quantum dot.
- To design time-dependent electric fields considering spin-orbit coupling.
- To simplify experimental implementation and explore alternative shortcut strategies.
Main Methods:
- Utilizing counter-diabatic driving to accelerate adiabatic spin manipulation.
- Designing time-dependent electric fields in a two-electron double quantum dot system.
- Transforming the Hamiltonian using Lie algebra for simplified control.
- Quantifying the energy-time relation to determine operation time bounds.
Main Results:
- Successfully demonstrated fast adiabatic spin manipulation using designed electric fields.
- Simplified the control by transforming the Hamiltonian, allowing the use of a single electric field component.
- Established a lower bound for operation time based on electric field amplitude.
- Showcased high fidelity in the presence of noise and systematic errors.
Conclusions:
- Counter-diabatic driving offers an effective method for speeded-up adiabatic control in quantum systems.
- Lie algebra transformation simplifies the experimental realization of shortcuts to adiabaticity.
- The proposed method effectively avoids decoherence, preserving fidelity in fast quantum operations.
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