Axion mass estimates from resonant Josephson junctions

Several small Josephson junctions in a resonant cavity: Deviation from the Dicke model

We have studied quantum mechanically a system of several small identical Josephson junctions in a lossless single-mode cavity for different initial states, under conditions such that the system is at resonance. This system is analogous to a collection of identical atoms in a cavity, which is described under appropriate conditions by the Dicke model. We find that our system can be well approxima...

Delayed pulses from high-transparency Josephson junctions

Calculations of the shape and the timing of single-magnetic-flux quanta ~SFQs! generated by high-current-density ‘‘self-shunted’’ Josephson junctions are presented. The junction current is assumed to be due in part to multiple Andreev reflections within the high-transparency barrier. The SFQ pulses from these junctions show several differences when compared to those from lower-current-density r...

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...

Axion physics in a Josephson junction environment

We show that recent experiments based on Josephson junctions, SQUIDs, and coupled Josephson qubits have a cosmological interpretation in terms of axionic dark matter physics, in the sense that they allow for analogue simulation of early-universe axion physics. We discuss new experimental setups in which SQUID-like axionic interactions in a resonant Josephson junction environment can be tested, ...

Topological Josephson φ0 junctions