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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
PubMed
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This summary is machine-generated.

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.

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  • 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.