A fast and large bandwidth superconducting variable coupler

H.-S. Chang, K. Satzinger, Y. Zhong, A. Bienfait, M. Chou, C. Conner, É. Dumur, J. Grebel, G. Peairs, R. Povey, A. Cleland
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引用次数: 5

Abstract

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 (SQUID) with two parallel Josephson junctions. The coupler is dissipation-free, 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.
一种快速大带宽超导可变耦合器
可变微波频率耦合器是传统通信系统中非常有用的器件,在量子通信中也将发挥重要作用。传统的基于半导体的微波耦合器已经被用于超导量子电路,例如,通过一个共同的读出链,可以对多个设备进行原位测量。然而,半导体元件是有损耗的,而且在开关时耗散能量,使它们不适合需要快速,重复开关的低温应用。基于超导约瑟夫森结的耦合器可以设计成具有快速开关的无耗散操作,并且很容易与超导量子电路集成。这使得芯片上的微波光子的量子相干路由成为可能,为半导体开关提供了一个有吸引力的替代方案。在这里,我们提出并表征了一种基于芯片的宽带微波可变耦合器,可调谐在4-8 GHz,瞬时带宽超过1.5 GHz,基于超导量子干涉器件(SQUID),具有两个并行约瑟夫森结。该耦合器无耗散,具有超过40 dB的大通断比,并且耦合可以在约10 ns内改变。这里提出的简单设计可以很容易地与超导量子比特电路集成,并且可以很容易地推广到实现四个或更多端口的设备。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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