Self-synchronous parametric amplification using Josephson junctions

Self-shunted Nb/AlOx/Nb Josephson junctions

We describe the fabrication and properties of high critical current density (Jc) Nb/AlOx/Nb Josephson junctions with deep-submicron dimensions. The junctions are fabricated using a planarized process in which all levels are patterned using a combination of optical and electron beam lithography. The base and counter electrodes are defined by reactive ion etching using quartz etch masks to give a...

Resonator coupled Josephson junctions; parametric excitations and mutual locking

Introduction to parametric amplification of quantum signals with Josephson circuits

Article history: Available online 10 August 2016

Traveling wave parametric amplifier with Josephson junctions using minimal resonator phase matching

resonator phase matching T. C. White, J. Y. Mutus, I.-C. Hoi, R. Barends, B. Campbell, Yu Chen, Z. Chen, B. Chiaro, A. Dunsworth, E. Jeffrey, J. Kelly, A. Megrant, C. Neill, P. J. J. O’Malley, P. Roushan, D. Sank, A. Vainsencher, J. Wenner, S. Chaudhuri, J. Gao, and John M. Martinis Department of Physics, University of California, Santa Barbara, California 93106-9530, USA Department of Material...

3He Josephson Junctions

The flow of superfluid 3He-B through a 65 3 65 array of nanometer-size apertures has been measured recently by Backhaus et al. They find in the current-phase relation a new branch, the so-called p state. We study two limiting cases which show that the p state arises from the coupling of the phase degree of freedom to the spin-orbit rotation. The p state exists in a single large aperture, but is...