Document Type

Article

Publication Date

11-22-2017

Publication Title

PHYSICAL REVIEW X

ISSN

2160-3308

Volume

7

Issue

4

First Page

041043

DOI

http://dx.doi.org/10.1103/PhysRevX.7.041043

Abstract

We report on the design and performance of an on-chip microwave circulator with a widely (GHz) tunable operation frequency. Nonreciprocity is created with a combination of frequency conversion and delay, and requires neither permanent magnets nor microwave bias tones, allowing on-chip integration with other superconducting circuits without the need for high-bandwidth control lines. Isolation in the device exceeds 20 dB over a bandwidth of tens of MHz, and its insertion loss is small, reaching as low as 0.9 dB at select operation frequencies. Furthermore, the device is linear with respect to input power for signal powers up to hundreds of fW (≈10^{3} circulating photons), and the direction of circulation can be dynamically reconfigured. We demonstrate its operation at a selection of frequencies between 4 and 6 GHz.

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This work is licensed under a Creative Commons Attribution 4.0 License.

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