Ultra linear magnetic flux-to-voltage conversion in superconducting quantum interference proximity transistors

• URL: http://arxiv.org/abs/2207.00339v1
• Date: Fri, 1 Jul 2022 11:12:49 GMT
• Title: Ultra linear magnetic flux-to-voltage conversion in superconducting quantum interference proximity transistors
• Authors: Giorgio De Simoni and Francesco Giazotto
• Abstract summary: We propose an intrinsically-linear flux-to-voltage mesoscopic transducer, called bi-SQUIPT, based on the superconducting quantum interference proximity transistor. The bi-SQUIPT provides a voltage-noise spectral density as low as $sim10-16$ V/Hz$1/2$ and, more interestingly, under a proper operation parameter selection, exhibits a spur-free dynamic range as large as $sim60$ dB.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Superconducting interferometers are quantum devices able to transduce a magnetic flux into an electrical output with excellent sensitivity, integrability and power consumption. Yet, their voltage response is intrinsically non-linear, a limitation which is conventionally circumvented through the introduction of compensation inductances or by the construction of complex device arrays. Here we propose an intrinsically-linear flux-to-voltage mesoscopic transducer, called bi-SQUIPT, based on the superconducting quantum interference proximity transistor as fundamental building block. The bi-SQUIPT provides a voltage-noise spectral density as low as $\sim10^{-16}$ V/Hz$^{1/2}$ and, more interestingly, under a proper operation parameter selection, exhibits a spur-free dynamic range as large as $\sim60$ dB, a value on par with that obtained with state-of-the-art SQUID-based linear flux-to-voltage superconducting transducers. Furthermore, thanks to its peculiar measurement configuration, the bi-SQUIPT is tolerant to imperfections and non-idealities in general. For the above reasons, we believe that the bi-SQUIPT could provide a relevant step-beyond in the field of low-dissipation and low-noise current amplification with a special emphasis on applications in cryogenic quantum electronics.

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