cross-wafer standard deviation of Jc was typically ~ 5% for anodized wafers but was ≥15% for unanodized wafers (Figure 6). A low variation in Jc results in a higher yield of device chips per wafer with the desired current density. As a result of the improved cross-wafer distribution, the cross-chip uniformity is greatly improved as well; typically < 1% for anodized chips. Low cross-chip Jc vari...

Nonequilibrium quasiparticles are ubiquitous in superconducting electronics. These can trap the internal Andreev bound states of a phase-biased Josephson junction, providing mechanism for studying their presence and behavior. We characterize quasiparticle trapping detector device based on two-junction aluminum nanobridge quantum interference incorporated into transmission-line resonator. When f...

We present a theory for the nonequilibrium current in a mesoscopic Josephson junction which is coupled to a normal electron reservoir, and apply it to a chaotic junction. Large sample-to-sample fluctuations of the critical current Ic are found, with rms Ic.ANeD/\ , when the voltage difference eV between the electron reservoir and the junction exceeds the superconducting gap D and the number of ...

In the past two years, magic-angle twisted bilayer graphene has emerged as a uniquely versatile experimental platform that combines metallic, superconducting, magnetic and insulating phases in single crystal. particular ability to tune superconducting state with gate voltage opened up intriguing prospects for novel device functionality. Here we present first demonstration of based on interplay ...

We present a hybrid semiconductor-based superconducting qubit device which remains coherent at magnetic fields up to 1 T. The transition frequency exhibits periodic oscillations with field, consistent interference effects due the flux threading cross section of proximitized semiconductor nanowire junction. As induced superconductivity revives, additional modes emerge high fields, we attribute i...

We report on a systematic analysis of the frequency spectrum of a system often considered for quantum computing purposes, metadevice applications, and high-sensitivity sensors, namely a superconducting loop interrupted by Josephson junctions, the core of an rf-SQUID. We analyze both the cases in which a single junction closes the superconducting loop and the one in which the single junction is ...

Due to their unique properties as lossless, nonlinear circuit elements, Josephson junctions lie at the heart of superconducting quantum information processing. Previously, we demonstrated a two-layer, submicrometer-scale overlap junction fabrication process suitable for qubits with long coherence times. Here, extend micrometer-scale junctions. This allows us fabricate other devices. For example...

Quantum mechanics consideration, supported by a concrete example, yielded standard sources of direct voltage measured frequency (which is the most accurate measurable physical quantity) and extremely sensitive instrument for measuring magnetic induction SQUID an acronym based on term Superconducting Interference Device). The possibility these measurements Josephson junction. In this paper, infl...