Researchers from the Shenzhen Institute for Quantum Science and Engineering, led by Tan Dian and supported by the Chinese Academy of Sciences, have achieved multi-mode phonon entanglement and transmission. The team utilized a two-dimensional hybrid quantum chip platform, integrating high-order bulk acoustic wave resonators (HBAR) with tunable superconducting qubits.
The experimental results demonstrated the preparation of two-mode, four-mode, and six-mode genuine multipartite entanglement states with fidelities of 0.912, 0.790, and 0.570, respectively. Furthermore, the team successfully transferred two-mode and four-mode entanglement states between two independent HBARs, achieving fidelities of 0.785 and 0.601.
By moving away from traditional three-dimensional microwave cavity architectures, the team integrated HBARs and superconducting qubits onto a single chip. This approach overcomes previous engineering limitations and allows for the distribution of entanglement resources across different quantum nodes, which is essential for building scalable quantum networks.
To characterize these states, the researchers developed a qubit-multiplexed tomography method, enabling the analysis of large-scale multi-mode phonon states using only two superconducting qubits. This study, published in Science on October 15, establishes a foundation for future modular, scalable phonon-based quantum information processing platforms.
