近日，瑞典斯德哥尔摩大学的Marion Mallweger及其研究小组与奥地利因斯布鲁克大学的Milena Guevara-Bertsch等人合作并取得一项新进展。经过不懈努力，他们实现超窄带复合脉冲囚禁离子的运动状态分析。相关研究成果已于2024年11月7日在国际知名学术期刊《物理评论A》上发表。

在这项工作中，该研究团队提出一种测量与谐振子耦合的二能级系统运动状态的方法。该技术利用蓝边带跃迁上的超窄带复合脉冲来扫描不同运动状态的布居。这一方法不依赖于对运动状态分布的任何先验知识，且易于实现。

无论是在兰姆-迪克区内还是区外，该方法均适用。特别是对于较高的声子数，复合脉冲序列可以用作测量声子数范围的滤波器。研究人员通过单个囚禁离子演示了这种测量技术，并使用数值评估的脉冲序列获得了良好的检测结果。

附：英文原文

Title: Motional-state analysis of a trapped ion by ultranarrowband composite pulses

Author: Marion Mallweger, Milena Guevara-Bertsch, Boyan T. Torosov, Robin Thomm, Natalia Kuk, Harry Parke, Christan F. Roos, Gerard Higgins, Markus Hennrich, Nikolay V. Vitanov

Issue&Volume: 2024/11/07

Abstract: In this work, we present a method for measuring the motional state of a two-level system coupled to a harmonic oscillator. Our technique uses ultranarrowband composite pulses on the blue sideband transition to scan through the populations of the different motional states. Our approach does not assume any previous knowledge of the motional state distribution and is easily implemented. It is applicable both inside and outside of the Lamb-Dicke regime. For higher phonon numbers especially, the composite pulse sequence can be used as a filter for measuring phonon number ranges. We demonstrate this measurement technique using a single trapped ion and show good detection results with the numerically evaluated pulse sequence.

DOI: 10.1103/PhysRevA.110.053103

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.053103