近日，华南师范大学薛正远团队研究了具有局部驱动的半导体自旋量子比特鲁棒iswap门。相关论文于2025年10月27日发表在《物理评论A》杂志上。

可扩展量子计算需要高保真的双量子比特门。然而，退相干和控制误差是不可避免的，这将降低实现的量子操作的质量。

研究组提出了一个半导体自旋量子比特鲁棒iswap门协议，这是一个有前景的可扩展量子计算平台。他们的方案只在传统的交换耦合自旋量子比特上进行局部微波驱动。这种方法同时解决了半导体量子计算的两个关键挑战：它通过连续动态解耦来抑制低频噪声，并且它规避了与交换相互作用的交流调制相关的控制困难。

研究组进一步开发了一种复合脉冲序列来消除驱动强度约束和一种动态校正方法来提供对微波振幅误差的一阶免疫。数值模拟结果表明，在目前的实验条件下，该方案可以达到高于容错阈值的保真度，为实际的量子处理器提供了基础。

附：英文原文

Title: Robust iswap gates for semiconductor spin qubits with local driving

Author: Qi-Pei Liu, Zheng-Yuan Xue

Issue&Volume: 2025/10/27

Abstract: Scalable quantum computation demands high-fidelity two-qubit gates. However, decoherence and control errors are inevitable, which can decrease the quality of implemented quantum operations. We propose a robust iswap gate protocol for semiconductor spin qubits, which is a promising platform for scalable quantum computing. Our scheme uses only local microwave drives on conventional exchange-coupled spin qubits. This approach simultaneously addresses two critical challenges to semiconductor quantum computing: It suppresses low-frequency noise via continuous dynamical decoupling, and it circumvents the control difficulties associated with the ac modulation of the exchange interaction. We further develop a composite pulse sequence to remove drive-strength constraints and a dynamically corrected method to provide first-order immunity to microwave amplitude errors. Numerical simulations confirm that our scheme can achieve fidelity above the fault-tolerance threshold under current experimental conditions, offering a building block for practical quantum processors.

DOI: 10.1103/68m1-mjzy

Source: https://journals.aps.org/pra/abstract/10.1103/68m1-mjzy