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Anisotropic spin exchange in pulsed quantum gates.
N E Bonesteel1, D Stepanenko, D P DiVincenzo
1Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
Physical Review Letters
|November 3, 2001
Summary
We demonstrate a method to remove unwanted spin-orbit interaction effects in two-qubit quantum gates by carefully controlling the timing of spin coupling. This technique enables robust quantum computation.
Area of Science:
- Quantum Information Science
- Quantum Computing
- Atomic, Molecular, and Optical Physics
Background:
- Spin-orbit interaction is a significant challenge in achieving high-fidelity quantum gates.
- Controlling interactions between qubits is crucial for building scalable quantum computers.
Purpose of the Study:
- To develop a technique for eliminating the first-order effects of spin-orbit interaction in two-qubit quantum gates.
- To enable more robust and accurate quantum computations.
Main Methods:
- Tailoring the time dependence of the coupling between neighboring spins.
- Deriving an effective Hamiltonian to analyze the spin coupling.
- Employing time-symmetric pulsing and optimized pulse shapes.
Main Results:
- Successfully eliminated first-order spin-orbit interaction effects.
- Developed a systematic method for analyzing and controlling spin coupling.
- Achieved an effectively isotropic exchange gate through optimized pulse shapes.
Conclusions:
- The proposed method provides a pathway to high-fidelity two-qubit gates.
- This technique is essential for advancing universal quantum computation.
- Optimized spin coupling control is key to overcoming decoherence sources.