约瑟夫森效应
微波食品加热
电子线路
超导量子计算
带宽(计算)
光电子学
消散
量子位元
物理
量子
超导电性
材料科学
电子工程
计算机科学
电信
工程类
量子力学
作者
Hung-Shen Chang,Kevin J. Satzinger,Youpeng Zhong,Audrey Bienfait,Ming-Han Chou,Christopher Conner,Étienne Dumur,Joel Grebel,G. A. Peairs,Rhys Povey,A. N. Cleland
摘要
Variable microwave-frequency couplers are highly useful components in classical communication systems and likely will play an important role in quantum communication applications. Conventional semiconductor-based microwave couplers have been used with superconducting quantum circuits, enabling, for example, the in situ measurements of multiple devices via a common readout chain. However, the semiconducting elements are lossy and furthermore dissipate energy when switched, making them unsuitable for cryogenic applications requiring rapid, repeated switching. Superconducting Josephson junction-based couplers can be designed for dissipation-free operation with fast switching and are easily integrated with superconducting quantum circuits. These enable on-chip, quantum-coherent routing of microwave photons, providing an appealing alternative to semiconductor switches. Here, we present and characterize a chip-based broadband microwave variable coupler, tunable over 4–8 GHz with over 1.5 GHz instantaneous bandwidth, based on the superconducting quantum interference device with two parallel Josephson junctions. The coupler is dissipation-free and features large on-off ratios in excess of 40 dB, and the coupling can be changed in about 10 ns. The simple design presented here can be readily integrated with superconducting qubit circuits and can be easily generalized to realize a four- or more port device.
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