Batch Optimization of Frequency-Modulated Pulses for Robust Two-qubit Gates in Ion Chains

Abstract

Two-qubit gates in trapped-ion quantum computers are generated by applying spin-dependent forces that temporarily entangle the internal state of the ion with its motion. Laser pulses are carefully designed to generate a maximally entangling gate between the ions while minimizing any residual entanglement between the motion and the ion. The quality of the gates suffers when the actual experimental parameters differ from the ideal case. Here, we improve the robustness of frequency-modulated Mølmer-Sørensen gates to motional mode-frequency offsets by optimizing the average performance over a range of systematic errors using batch optimization. We then compare this method with frequency-modulated gates optimized for ideal parameters that include an analytic robustness condition. Numerical simulations show good performance up to 12 ions, and the method is experimentally demonstrated on a two-ion chain.

References in corpus (8)

• High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit
• Experimental Comparison of Two Quantum Computing Architectures
• High-fidelity laser-free universal control of two trapped ion qubits
• Robust two-qubit gates in a linear ion crystal using a frequency-modulated driving force
• Ion trap quantum gates with amplitude-modulated laser beams
• Robust and resource-efficient microwave near-field entangling ${}^9$Be${}^{+}$ gate
• Phase-modulated decoupling and error suppression in qubit-oscillator systems
• Experimentally Realizing Efficient Quantum Control with Reinforcement Learning

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