High-Resolution Digital SQUID Magnetometer using Sub-Flux Quantum Feedback. (June 2020)

• Record Type: Journal Article
• Authors: Myoren, Hiroaki; Okabe, Kosuke; Matsunawa, Ryo; Itagaki, Kohki; Naruse, Masato; Taino, Tohru
• Is Part Of: Journal of physics. Volume 1559(2020)
• Publication Date: 2020-06
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1559/1/012013
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: Digital SQUIDs with the single flux quantum (SFQ) feedback have attracted much attention because of the feasibility of realizing a wide dynamic range and high slew rate for digital magnetometers. In order to realize higher resolution, we have studied a digital SQUID with sub-flux quantum feedback. Combining the sub-flux quantum feedback to a feedback loop and the direct SFQ feedback to a main loop triggered by carry SFQ pulses from an up/down counter. In this study, we discuss the method of multi-flux quantum generation and compact design of the SFQ up/down counter for high-speed operation of the digital SQUID magnetometer.