论文标题
用于超导Qubit的模块化可调耦合器
Modular tunable coupler for superconducting qubits
论文作者
论文摘要
模块化和多功能量子互连硬件的开发是量子信息平台扩展到更大尺寸和更大功能的关键下一步。对于超导量子系统，快速且控制良好的可调电路耦合器对于实现高保真度和资源有效连通性将是至关重要的，无论是为了执行两倍的门操作，编码还是解码量子数据总线，还是跨模态进行交流。在这里，我们提出了一种多功能且内部可调的双传输耦合器（DTC）体系结构，该体系结构在三连接DCSQUID中通过磁通控制的干扰实现可调耦合。至关重要的是，DTC具有内部定义的零耦合状态，该状态独立于耦合数据量值或电路谐振器。这使其作为模块化和多功能设计元素特别有吸引力，可在多种应用中实现快速，稳健的线性耦合，例如高保真两倍的门操作，Qubit读数和量子总线接口。
The development of modular and versatile quantum interconnect hardware is a key next step in the scaling of quantum information platforms to larger size and greater functionality. For superconducting quantum systems, fast and well-controlled tunable circuit couplers will be paramount for achieving high fidelity and resource efficient connectivity, whether for performing two-qubit gate operations, encoding or decoding a quantum data bus, or interfacing across modalities. Here we propose a versatile and internally-tunable double-transmon coupler (DTC) architecture that implements tunable coupling via flux-controlled interference in a three-junction dcSQUID. Crucially, the DTC possesses an internally defined zero-coupling state that is independent of the coupled data qubits or circuit resonators. This makes it particular attractive as a modular and versatile design element for realizing fast and robust linear coupling in several applications such as high-fidelity two-qubit gate operations, qubit readout, and quantum bus interfacing.
