2 SQUID. (Superconductive QUantum Interference Device) SQUID 2. ( 0 = Wb) SQUID SQUID SQUID SQUID Wb ( ) SQUID SQUID SQUID

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2 SQUID (Superconductive QUantum Interference Device) SQUID ( 0 = Wb) SQUID SQUID SQUID SQUID Wb ( ) SQUID SQUID ( 0 ) SQUID 0 [1, 2] SQUID SQUID SQUID SQUID 2 SQUID SQUID ( 0 = Wb) GHz () = ( ) ( ) 2 SQUID SQUID SQUID 2 SQUID SQUID 2 SQUID SQUID 2 SQUID 1

3 2 SQUID 4 T T (OPEN, SUSHI) 2 SQUID k L t 0.5 k L t 0.5 3T (w/ CTL shield) OPEN 5 T 100GHz SQUID 0 1/100 3 T T T T

4 [4] 4 T T T 100 GHz [1] T. Reich et al., Experimental study of a hybrid single flux quantum digital superconducting quantum interference device magnetometer, J. Appl. Phys., vol. 104, p , [2] I. Haverkamp et al., Linearity of a Digital SQUID Magnetometer, IEEE Trans. Appl. Supercond., vol. 21, pp , [3] M. Hidaka, S. Nagasawa, T. Satoh, K. Hinode, and Y. Kitagawa, Current status and future prospect of the Nb-based fabrication process for single flux quantum circuits, Supercond. Sci. Technol., vol. 19, pp. S138 S142, Feb [4] S. Iwasaki, M. Tanaka, N. Irie, A. Fujimaki, N. Yoshikawa, H. Terai, and S. Yorozu, Quantitative evaluation of delay time in the single-flux-quantum circuits, Physica C, vol , pp , May [1] K. Sato, Y. Yamanashi, and N. Yoshikawa, High Speed Operation of Single Flux Quantum Multiple Input Merger Using a Magnetically Coupled SQUID Stack, IEEE Trans. Appl. Supercond., vol. 25, no. 3, p , Jun [2] S. Nishimoto, Y. Yamanashi, and N. Yoshikawa, Design Method of Single Flux Quantum Logic Circuits Using Dynamically Reconfigurable Logic Gates, IEEE Trans. Appl. Supercond., vol. 25, no. 3, p , Jun [3] Y. Yamanashi and N. Yoshikawa, Design and Evaluation of Magnetic Field Tolerant Single Flux Quantum Circuits for Superconductive Sensing Systems, IEICE Trans. Electron., vol. E97-C, no. 3, pp , Mar [4] K. Aoki, Y. Yamanashi, and N. Yoshikawa, Multiplexing Techniques of Single Flux Quantum Circuit Based Readout Circuit for a Multi-Channel Sensing System, IEEE Trans. Appl. Supercond., vol. 23, no. 3, p , Jun. [5] Y. Tsuga, Y. Yamanashi, and N. Yoshikawa, Asynchronous Digital SQUID Magnetometer with an On-Chip Magnetic Feedback for Improvement of Magnetic Resolution, IEEE Trans. Appl. Supercond., vol. 23, no. 3, p , Jun. 10 [2] F. China, Y. Yamanashi, and N. Yoshikawa, Performance Estimation and Design of High-Sensitive Superconductive Digital Magnetometer, 27th International Symposium on Superconductivity (ISS2014), Tokyo, Japan, Nov [5] F. China, High sensitivity superconducting digital magnetometer, Stellenbosch Workshop on Superconductive Circuit Modelling and Layout Extraction, Stellenbosch, South Africa, Sep [6] Y. Yamanashi, Design and high-speed test of magnetic-field-tolerant single-flux-quantum circuits, Stellenbosch Workshop on Superconductive Circuit Modelling and Layout Extraction, Stellenbosch, South Africa, Sep [4] K. Sato, Y. Yamanashi, and N. Yoshikawa, High Speed Operation of Single Flux Quantum Multiple Input Merger Using a Magnetically Coupled SQUID Stack, Applied Superconductivity Conference (ASC) 2014, Charlotte, US, Aug [5] K. Sato, Y. Yamanashi, and N. Yoshikawa, Design and Implementation of a High Sensitive DC/SFQ Converter Superconductive Superconducting SFQ VLSI Workshop (SSV) 2013, Tsukuba, Japan, Nov. [6] F. China, Y. Yamanashi, and N. Yoshikawa, Improvement of Slew Rate of High-Sensitive Superconductive Digital Magnetometer Superconducting SFQ VLSI Workshop (SSV) 2013, Tsukuba, Japan, Nov. [7] Y. Yamanashi, Recent Research Activities in YNU, 8th FLUXONICS RSFQ Design Workshop 2013, Ilmenau, Germany, Sep. [8] Y. Yamanashi, Y. Tsuga, and N. Yoshikawa, Magnetic field tolerant single-flux-quantum circuit for superconducting sensing system, International Superconductive Electronics

5 Conference (ISEC) 2013, Cambridge, USA, Jul. [9] K. Sato, Y. Yamanashi, and N. Yoshikawa, Novel multiple input single flux quantum merge circuit using serially connected dc-squids, International Superconductive Electronics Conference (ISEC) 2013, Cambridge, USA, Jul. [10] F. China, Y. Yamanashi, and N. Yoshikawa, New superconductive digital magnetometer with sub-flux quantum resolution, International Superconductive Electronics Conference (ISEC) 2013, Cambridge, USA, Jul (1) (Yamanashi Yuki)

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