Fast M{\o}lmer-S{\o}rensen gates in trapped-ion quantum processors with compensated carrier transition

TL;DR

This paper introduces a method to design laser pulses that compensate for carrier transition effects, enabling faster and more accurate Mølmer-Sørensen gates in trapped-ion quantum processors.

Contribution

The authors develop a nonlinear transformation of laser pulses to mitigate carrier transition effects, improving gate speed and fidelity in ion chain quantum computing.

Findings

Achieves infidelity below 10^{-4} in simulations

Enables gate durations of tens of microseconds

Effective for ion chains up to 20 ions

Abstract

Carrier transition is one of the major factors hindering the high-speed implementation of the M{\o}lmer-S{\o}rensen gates in trapped-ion quantum processors. We present an approach to design laser pulse shapes for the M{\o}lmer-S{\o}rensen gate in ion chains which accounts for the effect of carrier transition on qubit-phonon dynamics. We show that the fast-oscillating carrier term effectively modifies the spin-dependent forces acting on ions, and this can be compensated by a simple nonlinear transformation of a laser pulse. Using numerical simulations for short ion chains and perturbation theory for longer chains up to $20$ ions, we demonstrate that our approach allows to reach the infidelity below $10^{-4}$ while keeping the gate duration of the order of tens of microseconds.