A fast and large bandwidth superconducting variable coupler

Chang, H. -S.; Satzinger, K. J.; Zhong, Y. P.; Bienfait, A.; Chou, M. -H.; Conner, C. R.; Dumur, É.; Grebel, J.; Peairs, G. A.; Povey, R. G.; Cleland, A. N.

doi:10.1063/5.0028840

Title: A fast and large bandwidth superconducting variable coupler

Journal Article · Mon Dec 14 00:00:00 EST 2020 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0028840· OSTI ID:1797758

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Univ. of Chicago, IL (United States)
Univ. of Chicago, IL (United States); Univ. of California, Santa Barbara, CA (United States); Google, Santa Barbara, CA (United States)
Univ. of Chicago, IL (United States); Univ. Claude Bernard, Lyon (France)
Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Univ. Grenoble Alpes (France)
Univ. of Chicago, IL (United States); Univ. of California, Santa Barbara, CA (United States)
Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

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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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Air Force Research Laboratory (AFRL), Air Force Office of Scientific Research (AFOSR); U.S. Army Research Laboratory; National Science Foundation (NSF); Argonne National Laboratory, Laboratory Directed Research and Development (LDRD); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1797758

Alternate ID(s):: OSTI ID: 1735680

Journal Information:: Applied Physics Letters, Vol. 117, Issue 24; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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