We propose and demonstrate the functioning of a special Rapid Single Flux Quantum (RSFQ) circuit with frequency-dependent damping. This damping is achieved by shunting individual Josephson junctions by pieces of open-ended RC transmission lines. Our circuit includes a toggle flip-flop cell, Josephson transmission lines transferring single flux quantum pulses to and from this cell, as well as DC/SFQ and SFQ/DC converters. Due to the desired frequency-dispersion in the RC line shunts which ensures sufficiently low noise at low frequencies, such circuits are well-suited for integrating with the flux/phase Josephson qubit and enable its efficient control.
Cite
@article{arxiv.0804.0442,
title = {Single flux quantum circuits with damping based on dissipative transmission lines},
author = {E. M. Tolkacheva and D. V. Balashov and M. I. Khabipov and A. B. Zorin},
journal= {arXiv preprint arXiv:0804.0442},
year = {2008}
}