So far, superconducting quantum computers have certain constraints on qubit connectivity, such as nearest-neighbor couplings. To overcome this limitation, we propose a scalable architecture to simultaneously connect several pairs of distant qubits via a dispersively coupled quantum bus. The building block of the bus is composed of orthogonal coplanar waveguide resonators connected through ancillary flux qubits working in the ultrastrong coupling regime. This regime activates virtual processes that boost the effective qubit–qubit interaction, which results in quantum gates on the nanosecond timescale. The interaction is switchable and preserves the coherence of the qubits.

到目前为止，超导量子计算机对量子位的连接有一定的限制，例如最近的邻居耦合。为克服此限制，我们提出了一种可扩展的体系结构，以通过色散耦合量子总线同时连接几对遥远的量子比特。总线的组成部分由正交共面波导谐振器组成，这些谐振器通过以超强耦合方式工作的辅助通量量子位连接。这种机制激活了虚拟过程，从而增强了有效的量子位-量子位相互作用，从而导致了纳秒级的量子门。交互是可切换的，并保留了量子位的连贯性。