Related papers: Pulse optimization for high-precision motional-mode characterization in trapped-ion quantum computers

Pulse optimization for high-precision motional-mode characterization in trapped-ion quantum computers

URL: http://arxiv.org/abs/2307.15841v2
Date: Thu, 4 Apr 2024 23:29:11 GMT
Title: Pulse optimization for high-precision motional-mode characterization in trapped-ion quantum computers
Authors: Qiyao Liang, Mingyu Kang, Ming Li, Yunseong Nam,
Abstract summary: High-fidelity operation of quantum computers requires precise knowledge of the physical system through characterization. For motion-mediated entanglement generation in trapped ions, it is crucial to have precise knowledge of the motional-mode parameters such as the mode frequencies and the Lamb-Dicke parameters.
Score: 4.7487511537612335
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: High-fidelity operation of quantum computers requires precise knowledge of the physical system through characterization. For motion-mediated entanglement generation in trapped ions, it is crucial to have precise knowledge of the motional-mode parameters such as the mode frequencies and the Lamb-Dicke parameters. Unfortunately, the state-of-the-art mode-characterization schemes do not easily render the mode parameters in a sufficiently scalable and accurate fashion, due to the unwanted excitation of adjacent modes in the frequency space when targeting a single mode, an effect known as the \textit{cross-mode coupling}. Here, we develop an alternative scheme that leverages the degrees of freedom in pulse design for the characterization experiment such that the effects of the cross-mode coupling is actively silenced. Further, we devise stabilization methods to accurately characterize the Lamb-Dicke parameters even when the mode frequencies are not precisely known due to experimental drifts or characterization inaccuracies. We extensively benchmark our scheme in simulations of a three-ion chain and discuss the parameter regimes in which the shaped pulses significantly outperform the traditional square pulses.

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