苏州大学Xing-Yu Zhu团队近日揭示了量子点中自旋量子比特的谐振器激活纠缠门。该研究于2025年6月26日发表在《物理评论A》杂志上。

半导体量子点中的电子自旋是一种很有前途的可扩展量子信息处理方法。然而，一个关键和具有挑战性的步骤是实现空间分离的自旋量子比特之间的高保真控制和纠缠。

研究组提出了一种基于共振诱导相位实现两个远距离自旋量子比特之间纠缠门的方案。由于该方案只需要微波控制谐振器，自旋量子位可以在其最佳点工作并表现出高频灵活性。他们研究了谐振器诱导相门的相干动力学，并证明了在现实条件下，在几十纳秒的短时间内实现高保真度为93.5%的可控z门的潜力。

研究组还证明了该方案相对于控制脉冲参数中扰动的有效性。此外，他们的方案可以产生非局部纠缠态，并且可以很容易地扩展到多量子位体系结构。这些结果为实现自旋量子比特的大规模量子计算提供了强有力的支持。

附：英文原文

Title: Resonator-activated entangling gates for spin qubits in quantum dots

Author: Wan-Qin He, Jin-Rong Liu, Xing-Yu Zhu

Issue&Volume: 2025/06/26

Abstract: The electron spin in semiconductor quantum dots is a promising candidate for scalable quantum information processing. However, a critical and challenging step is achieving high-fidelity control and entanglement between spatially separated spin qubits. Here we propose a scheme for implementing entangling gates between two long-distance spin qubits based on the resonator-induced phase. Since the scheme only requires microwave control of the resonator, the spin qubits can operate at their sweet spots and exhibit high-frequency flexibility. We investigate the coherent dynamics of the resonator-induced phase gate and demonstrate the potential to achieve a controlled-Z gate with a high fidelity of 93.5% within a short timescale of tens of nanoseconds under realistic conditions. We also show the robustness of this scheme with respect to perturbations in the control pulse parameters. Furthermore, our scheme can be used to generate nonlocal entangled states and can be easily extended to multiqubit architectures. These results provide strong support for the realization of large-scale quantum computing with spin qubits.

DOI: 10.1103/xx7c-36f5

Source: https://journals.aps.org/pra/abstract/10.1103/xx7c-36f5