Robust quantum gate optimization with first-order derivatives of ion–phonon and ion–ion couplings in trapped ions  

作　　者：Jing-Bo Wang 汪景波

机构地区：[1]Beijing Academy of Quantum Information Sciences,Beijing 100193,China

出　　处：《Chinese Physics B》2025年第4期287-294,共8页中国物理B(英文版)

摘　　要：Trapped ion hardware has made significant progress recently and is now one of the leading platforms for quantum computing.To construct two-qubit gates in trapped ions,experimentalmanipulation approaches for ion chains are becoming increasingly prevalent.Given the restricted control technology,how implementing high-fidelity quantum gate operations is crucial.Many works in current pulse design optimization focus on ion–phonon and effective ion–ion couplings while ignoring the first-order derivative terms expansion impacts of these two terms brought on by experiment defects.This paper proposes a novel robust quantum control optimization method in trapped ions.By introducing the first-order derivative terms caused by the error into the optimization cost function,we generate an extremely robust Mølmer–Sørensen gate with infidelity below 10−3 under a drift noise range of±10 kHz,the relative robustness achieves a tolerance of±5%,compared to the 200-kHz frequency spacing between phonon modes,and for time noise drift,the tolerance reached to 2%.Our work reveals the vital role of the first-order derivative terms of coupling in trapped ion pulse control optimization,especially the first-order derivative terms of ion–ion coupling.It provides a robust optimization scheme for realizing more efficient entangled states in trapped ion platforms.

关 键 词：trapped ion quantum computing robust optimization high-fidelity quantum gates magnus expansion 

分 类 号：O413[理学—理论物理]