Programmable Adiabatic Rapid Passage laser pulses for Ultra-fast Gates on trapped ions

TL;DR

This paper introduces a programmable pulsed laser source for trapped-ion quantum gates, enabling high-fidelity, robust, and ultra-fast entangling operations through precise control of pulse parameters and adiabatic protocols.

Contribution

It presents a novel programmable pulsed laser system that enhances control over pulse profiles, significantly improving the fidelity and robustness of ultrafast quantum gates in trapped-ion systems.

Findings

Achieves gate fidelities above 99.99%

Demonstrates robustness against pulse intensity variations

Supports implementation of various adiabatic population transfer schemes

Abstract

Scaling of quantum gates remains a central challenge in quantum information science. Ultrafast gates based on spin-dependent kicks provide a promising approach for trapped-ion systems. However, these gates require laser pulses with both high temporal tunability and stability, which are difficult to achieve with existing pulsed sources. Here, we propose a programmable pulsed source that allows flexible control of pulse intensity, waveform, and phase profiles. This enables precise manipulation of pulse sequences, thereby improving the fidelity of entangling gates. Furthermore, since the pulse parameters can be conveniently tuned, various coherent population-transfer schemes can be implemented adiabatic SDKs, thereby improving both the fidelity and robustness of fast quantum gate. Simulation results show that our programmable pulse system can achieve gate fidelities above 99.99% with strong robustness against variations in pulse intensity and single-photon detuning using stimulated Raman adiabatic rapid passage (STIRARP) protocols.