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URSI General Assembly and Scientific Symposium

Josephson Effect based Superconducting Electronics

P. Russer, Johannes A. Russer

Published Aug 1, 2020• 1 citation
Publisher

Abstract

Josephson parametric amplifiers (JPAs) operated in the coherent quantum regime exhibit ultimate sensitivity. We review physical principles, properties and applications of JPAs in quantum information processing.
DOI
10.23919/ursigass49373.2020.9231988

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In quantum information processing, the Josephson parametric amplifier (JPA) has become a crucial tool for fast, high-fidelity readout of superconducting qubits, and for the generation of squeezed microwave radiation. However, research groups worldwide have reported unexpected nonidealities in these devices, leading to poorer than anticipated performance. Using numerical simulations complemented by experiments, the authors pinpoint oft-neglected higher-order circuit nonlinearities as the main source of these nonidealities, and provide simple, concrete steps to improve JPA performance.
Josephson parametric amplifiers (JPAs) are important tools in quantum information technology, and traveling-wave JPAs with extended bandwidth are especially desired for frequency multiplexing, e.g.e.g.e.g. in qubit readout. So far these devices have required the four-wave mixing condition to operate. The author shows, however, that there is a way to realize $t\phantom{\rule{0}{0ex}}h\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}e-w\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}v\phantom{\rule{0}{0ex}}e$ mixing, with negligible phase mismatch. This simple traveling-wave amplifier would offer large gain, wide bandwidth, and ultimately quantum-limited characteristics, outperforming its state-of-the-art four-wave counterparts.
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