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High-Fidelity Two-Qubit Gates Using a Microelectromechanical-System-Based Beam Steering System for Individual Qubit
Ye Wang1, Stephen Crain1, Chao Fang1
1Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA.
Physical Review Letters
|October 23, 2020
Summary
Researchers achieved high-fidelity two-qubit gates in atomic ion quantum computers with up to four ions. This demonstrates a key step towards scalable, fault-tolerant quantum computation.
Area of Science:
- Quantum Information Science
- Atomic Physics
- Quantum Computing
Background:
- Scalable quantum computers require high-fidelity operations across multiple qubits.
- Trapped atomic ions are a leading platform for quantum computation due to long coherence times and high gate fidelities.
Purpose of the Study:
- To realize and characterize high-fidelity two-qubit gates in a multi-ion system.
- To assess the scalability of gate operations in trapped ion systems.
- To identify error sources and pathways for improvement in quantum gate performance.
Main Methods:
- Utilizing a trapped atomic ion system with up to four ions.
- Employing radial modes for two-qubit gate operations.
- Individual ion addressing via tightly focused laser beams steered by microelectromechanical system mirrors.
- Measuring final state fidelity after sequences of up to 21 two-qubit gates.
Main Results:
- Achieved a gate fidelity of 99.49(7)% in a two-ion chain.
- Demonstrated a gate fidelity of 99.30(6)% in a four-ion chain.
- Characterized residual errors affecting gate performance.
Conclusions:
- High-fidelity two-qubit gates are achievable in multi-ion systems.
- The demonstrated fidelities are approaching requirements for fault-tolerant quantum computation.
- Further error characterization and mitigation strategies are crucial for advancing quantum computing.
