High resolution superconducting single flux quantum comparator for sub kelvin temperatures
A.M. Savin, J.P. Pekola, T. Holmqvist, J. Hassel, L. Gr\"onberg, P., Helist\"o, A. Kidiyarova-Shevchenko
TL;DR
This paper presents a superconducting SFQ comparator operating at subkelvin temperatures with high resolution and low power dissipation, suitable for quantum computing control circuits.
Contribution
It introduces a design with improved cooling of shunt resistors, achieving electron temperatures below 50 mK and demonstrating high-resolution operation at 2 GHz.
Findings
Current resolution of 40 nA at 2 GHz
Electron temperature below 50 mK in shunt resistors
Enhanced cooling techniques for SFQ circuits
Abstract
A design of subkelvin single flux quantum (SFQ) circuits with reduced power dissipation and additional cooling of shunt resistors for superconducting qubit control circuits has been developed and characterized. We demonstrate operation of SFQ comparators with current resolution of 40 nA at 2 GHz sampling rate. Due to improved cooling the electron temperature in shunt resistors of a SFQ comparator is below 50 mK when the bath temperature is about 30 mK.
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