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Scalable entangling gates on ion qubits via structured light addressing
Xueying Mai1,2, Liyun Zhang2, Qinyang Yu1,2
1Southern University of Science and Technology, Shenzhen 518055, China.
Science Advances
|April 1, 2026
Summary
Researchers developed a new trapped-ion quantum processor that enables high-fidelity entangling gates without complex pulse shaping. This advance simplifies control complexity and enhances scalability for practical quantum computing.
Area of Science:
- Quantum Computing
- Atomic Physics
Background:
- Trapped-ion systems offer scalability for quantum processors but face challenges with spectral crowding in larger systems.
- Spectral crowding necessitates complex pulse-shaping techniques, hindering gate fidelity and control simplicity.
Purpose of the Study:
- To develop a novel trapped-ion processor addressing control complexity and scalability challenges.
- To demonstrate high-fidelity two-qubit entangling gates without intricate pulse shaping.
Main Methods:
- Utilized an individual-addressing system generating steerable Hermite-Gaussian beam arrays.
- Coupled qubits selectively to sparse axial motional modes using beam transversal gradients.
- Isolated single or few motional modes as entanglement mediators.
Main Results:
- Successfully demonstrated addressable two-qubit entangling gates in ion chains up to six ions.
- Achieved consistent Bell-state preparation fidelities around 0.97.
- Eliminated the need for complex pulse shaping techniques.
Conclusions:
- The developed method significantly reduces control overhead for trapped-ion quantum processors.
- This approach enhances scalability, paving the way for practical large-scale quantum computing.
- Offers a crucial advance in overcoming limitations of current trapped-ion architectures.
