Frequency-tunable Kerr-free three-wave mixing with a gradiometric SNAIL

• URL: http://arxiv.org/abs/2112.09785v2
• Date: Thu, 12 May 2022 15:20:41 GMT
• Title: Frequency-tunable Kerr-free three-wave mixing with a gradiometric SNAIL
• Abstract summary: Three-wave mixing is a key process in superconducting quantum information processing. SNAIL-based devices present a Kerr-free flux-bias point where unwanted parasitic effects such as Stark shift are suppressed. With a single flux-bias parameter, these circuits can only host one Kerr-free point, limiting the range of their applications.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Three-wave mixing is a key process in superconducting quantum information processing, being involved in quantum-limited amplification and parametric coupling between superconducting cavities. These operations can be implemented by SNAIL-based devices that present a Kerr-free flux-bias point where unwanted parasitic effects such as Stark shift are suppressed. However, with a single flux-bias parameter, these circuits can only host one Kerr-free point, limiting the range of their applications. In this Letter, we demonstrate how to overcome this constraint with a gradiometric SNAIL, a doubly-flux biased superconducting circuit for which both effective inductance and Kerr coefficient can be independently tuned. Experimental data show the capability of the gradiometric SNAIL to suppress Kerr effect in a three-wave mixing parametric amplifier over a continuum of flux bias points corresponding to a 1.7 GHz range of operating frequencies.

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