Mesoscopic cross-film cryotrons: Vortex trapping and dc-Josephson-like oscillations of the critical current

基于超导加热器低温管的低温可重构逻辑：提升面积效率并实现伪装处理器

Cryogenic Reconfigurable Logic with Superconducting Heater Cryotron: Enhancing Area Efficiency and Enabling Camouflaged Processors

本文提出基于单个hTron的低温可重构逻辑电路，通过调节偏置实现copy、NOT、AND、OR及多数逻辑，减少器件数量并支持同版图伪装以抵御逆向工程。

Quasiparticle trapping in Meissner and vortex states of mesoscopic superconductors

Nowadays superconductors serve in numerous applications, from high-field magnets to ultra-sensitive detectors of radiation. Mesoscopic superconducting devices, i.e. those with nanoscale dimensions, are in a special position as they are easily driven out of equilibrium under typical operating conditions. The out-of-equilibrium superconductors are characterized by non-equilibrium quasiparticles. These extra excitations can compromise the performance of mesoscopic devices by introducing, e.g., leakage currents or decreased coherence times in quantum devices. By applying an external magnetic field…

Vortex crossing and trapping in doubly connected mesoscopic loops of a single-crystal type II superconductor

Numerical calculations on a mesoscopic ring of a type II superconductor in the London limit suggest that an Abrikosov vortex can be trapped in such a structure above a critical magnetic field and generate a phase shift in the magnetoresistance oscillations. We prepared submicron-sized superconducting loops of single-crystal, type II superconductor NbSe$_2$ and measured magnetoresistance oscillations resulting from vortices crossing the loops. The free energy barrier for vortex crossing determines the crossing rate and is periodically modulated by the external magnetic flux threading the loop. …

Charge trapping and super-Poissonian noise centers in a cuprate high-temperature superconductor

The electronic properties of cuprate high temperature superconductors in their normal state are very two-dimensional: while transport in the ab plane is perfectly metallic, it is insulating along the c-axis, with ratios between the two exceeding 10^4. This anisotropy has been identified as one of the mysteries of the cuprates early on, and while widely different proposals exist for its microscopic origin, little is known empirically on the microscopic scale. Here, we elucidate the properties of the insulating layers with a newly developed scanning noise spectroscopy technique that can spatiall…

Polar molecules near superconducting resonators: a coherent, all-electrical, molecule-mesoscopic interface

The challenge of building a scalable quantum processor requires consolidation of the conflicting requirements of achieving coherent control and preservation of quantum coherence in a large scale quantum system. Moreover, the system should be compatible with miniaturization and integration of quantum circuits. Mesoscopic solid state systems such as superconducting islands and quantum dots feature robust control techniques using local electrical signals and self-evident scaling based on advances in fabrication; however, in general the quantum states of solid state devices tend to decohere rapidl…

Sr2RuO4双连通介观超导圆柱中半量子涡旋的磁阻振荡研究

Magnetoresistance oscillation study of the half-quantum vortex in doubly connected mesoscopic superconducting cylinders of Sr2RuO4

本文通过磁阻振荡测量在Sr2RuO4介观双连通圆柱中探测到半量子涡旋，揭示了其形成、穿越及捕获行为，并分析了面内磁场和测量电流的影响，为自旋三重态超导及HQV物理提供了新证据。