近日，华南师范大学王振宇团队实现了通过简单的相移提高受激拉曼跃迁的保真度。相关论文于2025年3月25日发表在《物理评论A》杂志上。

研究组证明，在受激拉曼跃迁中，向控制场引入一两个简单的相移可以显著提高状态操纵的保真度，同时减少向中间激发态的泄漏。该方法在任意失谐条件下实现了两个目标态之间的高保真量子门操作。

值得注意的是，在不延长整体进化时间的情况下，中间激发态的平均粒子数大约减半。此外，与传统的绝热消除技术相比，该方法对静态振幅和失谐误差表现出更大的鲁棒性，即使在存在耗散的情况下也能保持更高的保真度。

附：英文原文

Title: Enhancing the fidelity of stimulated Raman transitions with simple phase shifts

Author: Hua-Yang Wang, Xu-Yang Chen, Zhen-Yu Wang

Issue&Volume: 2025/03/25

Abstract: We demonstrate that in stimulated Raman transitions introducing one or two simple phase shifts to the control fields significantly enhances the fidelity of state manipulation while simultaneously reducing leakage to the intermediate excited state. Our approach achieves high-fidelity quantum gate operations between the two target states under arbitrary detuning conditions. Notably, the average population in the intermediate excited state is approximately halved, without extending the overall evolution time. Additionally, our method exhibits greater robustness to static amplitude and detuning errors compared to conventional adiabatic elimination techniques, and maintains higher fidelity even in the presence of dissipation.

DOI: 10.1103/PhysRevA.111.032619

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.111.032619