AI 中文总结
研究提出基于纠缠交换协议，利用超导传输子量子比特与YIG球体组成的混合架构，通过对量子比特进行贝尔态测量，将磁振子-量子比特纠缠转移到远程磁振子模式生成非局域磁振子猫态，为长距离磁振子纠缠及混合量子网络发展提供可行途径。
AI 中文摘要
相干态的量子叠加通过利用玻色子模式中的大希尔伯特空间，为传统的基于量子比特的编码提供了一种替代方案，包括在微波和光腔、磁振子和机械谐振器中实现的那些。除了在本地信息处理方面的优势外，为这种玻色子态建立长距离量子网络对于可扩展量子通信和分布式量子计算至关重要。在这项工作中，我们提出了一种基于纠缠交换的协议，以生成在空间上分离的子系统之间共享的二分磁振子猫态。每个子系统包括一个混合架构，由一个超导传输子量子比特耦合到一个支持磁振子模式的钇铁石榴石（YIG）球体组成。通过对量子比特进行投影贝尔态测量，最初建立的磁振子-量子比特纠缠被相干地转移到远程磁振子模式，从而产生一个非局域磁振子猫态。为了对生成的态进行实验表征，我们通过使用磁振子模式的联合位移奇偶测量来重建维格纳函数，从而进行量子态层析成像。我们的方案为实现长距离磁振子纠缠提供了一条可行的途径，并有助于推动混合量子网络架构的发展。
英文摘要
The quantum superpositions of coherent states offer an alternative to the conventional qubit-based encodings by harnessing the large Hilbert space available in bosonic modes, including those realised in microwave and optical cavities, magnons, and mechanical resonators. Beyond their advantages for local information processing, establishing long-distance quantum networks for such bosonic states is crucial for scalable quantum communication and distributed quantum computation. In this work, we propose an entanglement-swapping-based protocol to generate a bipartite magnonic cat state shared between spatially separated subsystems. Each subsystem comprises a hybrid architecture consisting of a superconducting transmon qubit coupled to a yttrium iron garnet (YIG) sphere that supports magnon modes. By performing a projective Bell-state measurement on the qubits, the initially established magnon-qubit entanglement is coherently transferred to the remote magnon modes, resulting in a nonlocal magnonic cat state. For experimental characterisation of the gener- ated states, we perform quantum state tomography through reconstruction of the Wigner function using joint displaced parity measurements of the magnon modes. Our scheme provides a feasible route towards realising long-distance magnonic entanglement and contributes to the advancement of hybrid quantum network architectures.
