中国科学技术大学李传锋团队近日研究了混合超导电路-机械谐振器系统中的抗噪声声子操作。2025年7月10日出版的《物理评论A》杂志发表了这项成果。

由超导电路和机械谐振器组成的混合系统是一个很有前途的量子技术平台。然而，由于混合系统的复杂能级和相互作用，实现声子态的高性能制备和操纵仍然是一个突出的挑战。

研究组提出了一种抗噪声声子操纵方案。利用工程超导-谐振腔色散相互作用，他们定制了一个与动态解耦脉冲相结合的控制序列，这构成了一套通用声子门操作的基础。利用这种栅极设计，研究组演示了Schr声子的定格猫态，复杂声子叠加态的创建，量子信息的编码和转移到声子态。

此外，研究组表明，在实际参数下，状态制备的保真度可以达到95%，并且与现有方案相比，这些设计显着降低了误差影响。这些结果为超导-力学混合系统提供了一个完整的工具箱。

附：英文原文

Title: Noise-resistant phonon operations in a hybrid superconducting circuit-mechanical resonator system

Author: Le-Tian Zhu, Xing-Yu Zhu, Guang-Can Guo, Tao Tu, Chuan-Feng Li

Issue&Volume: 2025/07/10

Abstract: Hybrid systems consisting of superconducting circuits and mechanical resonators are a promising platform for quantum technologies. However, realizing high-performance preparation and manipulation of phonon states remains an outstanding challenge due to the complex energy levels and interactions of hybrid systems. Here, we propose a noise-resistant phonon manipulation scheme. Using engineered superconducting-resonator dispersive interactions, we tailor a control sequence combined with dynamical decoupling pulses, which forms the basis for a universal set of phonon gate operations. Using this gate design, we demonstrate the preparation of Schrdinger cat states of phonons, the creation of complex phonon superposition states, and the encoding and transfer of quantum information into phonon states. In addition, we show that the fidelity of the state preparation can reach 95% under realistic parameters and that these designs significantly reduce the error effects compared to existing schemes. These results provide a complete toolbox for superconducting-mechanics hybrid systems.

DOI: 10.1103/41jh-w6ft

Source: https://journals.aps.org/pra/abstract/10.1103/41jh-w6ft