远程超导量子比特间的绝热受控-Z门
Remote Adiabatic Controlled-Z Gate between Distant Superconducting Qubits
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中文总结 AI 辅助
提出并数值验证了通过多模同轴电缆连接的远程超导量子比特间的绝热受控-Z门，无需额外耦合器，在30厘米电缆下实现4.71e-7的保真度误差，支持模块化扩展。
中文摘要 AI 辅助
空间分离量子比特间的直接纠缠门是模块化量子计算的关键能力。它们使得非局域量子电路能够在不同处理器模块间执行，从而缓解单芯片扩展限制并扩展系统的有效连接性。在此，我们提出并数值研究了一种通过多模同轴电缆连接的两个频率可调超导量子比特间的远程绝热受控-Z门。电缆介导的相互作用使得该门无需额外可调耦合器即可实现，保持了简单的电路架构。对于30厘米电缆，包含十个驻波模式的模拟在无退相干情况下实现了优化的门保真度误差为$4.71\ imes10^{-7}$，持续时间为376.7纳秒。该门在量子比特频率波动和毫米级电缆长度变化下仍保持高保真度。针对50厘米和100厘米电缆情况的计算展示了其在更大低温系统中的潜力。这些结果为将高保真量子操作扩展到单个芯片之外，迈向可扩展、互连的超导量子处理器提供了一种有前景的方法。
英文摘要
Direct entangling gates between spatially separated qubits are a key capability for modular quantum computing. They enable nonlocal quantum circuits to be executed across different processor modules, thereby alleviating single-chip scaling constraints and expanding the effective connectivity of the system. Here, we propose and numerically investigate a remote adiabatic controlled-Z gate between two frequency-tunable superconducting qubits connected by a multi-mode coaxial cable. The cable-mediated interaction enables the gate to be implemented without additional tunable couplers, preserving a simple circuit architecture. For a 30-cm cable, simulations incorporating ten standing-wave modes yield an optimized gate infidelity of $4.71\times10^{-7}$ with a duration of 376.7 ns in the absence of decoherence. The gate maintains high fidelity under qubit-frequency fluctuations and millimeter-scale cable-length variations. Calculations for 50- and 100-cm cable situations demonstrate its potential for even larger cryogenic systems. These results provide a promising approach to extending high-fidelity quantum operations beyond individual chips and toward scalable, interconnected superconducting quantum processors.
发表机构
- Beijing Academy of Quantum Information Sciences（北京量子信息科学研究院）
- Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所）
- University of Chinese Academy of Sciences（中国科学院大学）
- Hefei National Laboratory（合肥国家实验室）
机构由 AI 辅助整理，请以论文原文为准。
