近日，山西大学张天才团队实现了在电路量子声动力学系统中通过驱动量子比特产生两种声模的纠缠。该研究于2025年5月8日发表在《物理评论A》杂志上。

研究组提出了如何在由多模高频体声波谐振器和transmon型超导量子比特组成的电路量子声动力学系统中产生两个长寿命声子模的纠缠。两个声模通过压电相互作用耦合到量子比特，量子比特由微波场驱动。在量子比特与声模之间存在远失谐的条件下，量子比特可以绝热消除，从而建立两种声模之间的间接相互作用。 

研究组证明，通过适当选择驱动频率和强度，这种间接相互作用可以是参数放大型相互作用，因此声学模式之间的纠缠可以通过直接幺正演化产生。通过详细数值分析了产生纠缠的参数条件，并评估了系统耗散和噪声的影响。结果表明，该方案可以使用当前可用的参数来实现，并且对耗散和环境温度具有很强的鲁棒性。这项工作可以为基于声子系统的量子信息处理提供有效的资源。

附：英文原文

Title: Generating entanglement of two acoustic modes by driving the qubit in a circuit quantum acoustodynamics system

Author: Mei-Rong Wei, Qi Guo, Gang Li, Tiancai Zhang

Issue&Volume: 2025/05/08

Abstract: We propose how to generate the entanglement of two long-lived phonon modes in a circuit quantum acoustodynamics system, which consists of a multimode high-frequency bulk acoustic wave resonator and a transmon-type superconducting qubit. Two acoustic modes couple to the qubit through piezoelectric interaction, and the qubit is driven by a microwave field. Under the condition of far detuning between the qubit and acoustic modes, the qubit can be eliminated adiabatically, thus establishing the indirect interaction between the two acoustic modes. We demonstrate that such an indirect interaction can be a parametric-amplification-type interaction by appropriately choosing the drive frequency and strength, so the entanglement between acoustic modes can be created by the direct unitary evolution. We numerically analyze the parameter conditions for generating the entanglement in detail and evaluate the influence of system dissipations and noise. The results show that the scheme can be realized using currently available parameters and has strong robustness against the dissipations and the environmental temperature. This work may provide an efficient resource for the quantum information processing based on the phononic systems.

DOI: 10.1103/PhysRevA.111.052412

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.111.052412