Presentation

The activities at the CROMA laboratory of Université Savoie Mont Blanc have been focused on the development of RSFQ (Rapid Single Flux Quantum) digital superconducting electronics since 2000. Studies dealt with the study, design and experimental characterization of high and low critical temperature digital and analogue superconducting circuits, with a particular emphasis on the development of demonstrators based on analogue-to-digital converters. Two main applications were targeted: i) quantum-accurate digital SQUIDs magnetometers for applications in Geophysics, in particular to detect faint signals in presence of strong magnetic interferences, and, ii) sensitive microwave analogue-to-digital converter in the 8-30 GHz carrier frequency range for space telecommunications and possibly 6G communication systems. A connected activity deals with the development of user-friendly software to simulate devices and circuits used for superconductor electronics, including for qu-bit readout circuits.

Chosen publications

Razmkhah and P. Febvre, “JOINUS: A User-Friendly Open-Source Software to Simulate Digital Superconductor Circuits,” IEEE Transactions on Applied Superconductivity, vol. 30, no. 5, pp. 1-7, Aug. 2020, Art no. 1300807.  10.1109/TASC.2020.2976600

Sasan Razmkhah, Ali Bozbey and Pascal Febvre, “A Compact High Frequency Voltage Amplifier for Superconductor-Semiconductor Logic Interface,” Superconductor, Science and Technology, vol. 34(4), 045013, February 2021. doi: 10.1088/1361-6668/abdedb. https://arxiv.org/abs/2011.03625

Sasan Razmkhah and Pascal Febvre , “Beyond-CMOS: State of The Art and Trends,” Chapter 8: Superconducting Quantum Electronics, edited by Alessandro Cresti, ISTE Editions, pp.295-391, 21 July 2023. doi: 10.1002/9781394228713.ch8

Lucas Iwanikow, Pascal Febvre, “Influence of noise on Josephson junctions dynamics with a BCS theory-based model,” IEEE Transactions on Applied Superconductivity, vol. 34, no. 3, 1100105, May 2024. doi: 10.1109/TASC.2023.3334199  https://arxiv.org/abs/2309.15652