AI 中文总结
研究提出超导单重态 - 三重态（SST）量子比特，依赖约瑟夫森结中平行双量子点，无需自旋 - 轨道相互作用。该量子比特态与超导相位耦合，支持全对全连接，控制线开销小且受噪声线性保护，有望用于未来量子处理器。
AI 中文摘要
将量子点与约瑟夫森结集成的混合器件备受关注，因其结合了基于自旋的量子计算和电路量子电动力学方法。特别是安德列夫自旋量子比特已取得显著实验进展。本文提出超导单重态 - 三重态（SST）量子比特，其依赖于约瑟夫森结中平行排列的双量子点。与安德列夫自旋量子比特不同，SST 量子比特无需自旋 - 轨道相互作用，能让更多材料受益。它的量子比特态与结上超导相位耦合，支持全对全连接，控制线开销小，对电荷或磁通噪声有线性保护，是未来量子处理器的候选者。
英文摘要
Hybrid devices integrating quantum dots with Josephson junctions are gaining interest because they combine spin-based quantum computing with circuit quantum electrodynamics (circuit QED) methods. In particular, Andreev spin qubits have shown significant experimental progress including strong two-qubit coupling, and are predicted to exhibit all-to-all connectivity. Here we propose superconducting singlet-triplet (SST) qubits that rely on parallel-aligned double quantum dots in Josephson junctions. While Andreev spin qubits require spin-orbit interaction to unlock the spin degree-of-freedom, SST qubits do not require spin-orbit interaction, making the advantages of hybrid devices available to a wider range of materials. Similar to Andreev spin qubits, the qubit states couple to the superconducting phase across the junction, which allows for control and readout using circuit QED, and supports all-to-all connectivity. Only $N$ flux lines are required to perform any single- and two-qubit gate among $N$ qubits, and thus the overhead of control lines is small. Finally, linear protection from charge or flux noise makes these qubits interesting candidates for a future quantum processor.
Comments13 pages, 5 figures
