A fast and large bandwidth superconducting variable coupler
- URL: http://arxiv.org/abs/2011.09442v1
- Date: Wed, 18 Nov 2020 18:20:26 GMT
- Title: A fast and large bandwidth superconducting variable coupler
- Authors: Hung-Shen Chang, Kevin J. Satzinger, Youpeng Zhong, Audrey Bienfait,
Ming-Han Chou, Christopher R. Conner, \'Etienne Dumur, Joel Grebel, Gregory
A. Peairs, Rhys G. Povey, Andrew N. Cleland
- Abstract summary: Superconducting Josephson junction-based couplers can be designed for dissipation-free operation with fast switching.
These enable on-chip, quantum-coherent routing of microwave photons.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- 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.
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