Granular aluminium as a superconducting material for high-impedance quantum circuits.

Superconducting quantum information processing machines are predominantly based on microwave circuits with relatively low characteristic impedance, about 100 Ω, and small anharmonicity, which can limit their coherence and logic gate fidelity. A promising alternative is circuits based on so-called superinductors, with characteristic impedances exceeding the resistance quantum R = 6.4 kΩ.

Loss Mechanisms and Quasiparticle Dynamics in Superconducting Microwave Resonators Made of Thin-Film Granular Aluminum.

Superconducting high kinetic inductance elements constitute a valuable resource for quantum circuit design and millimeter-wave detection. Granular aluminum (grAl) in the superconducting regime is a particularly interesting material since it has already shown a kinetic inductance in the range of nH/□ and its deposition is compatible with conventional Al/AlOx/Al Josephson junction fabrication. We characterize microwave resonators fabricated from grAl with a room temperature resistivity of 4×10^{3}  μΩ cm, which is a factor of 3 below the superconductor to insulator transition, showing a kinetic inductance fraction close to unity.

Circuit quantum electrodynamics of granular aluminum resonators.

Granular aluminum (grAl) is a promising high kinetic inductance material for detectors, amplifiers, and qubits. Here we model the grAl structure, consisting of pure aluminum grains separated by thin aluminum oxide barriers, as a network of Josephson junctions, and we calculate the dispersion relation and nonlinearity (self-Kerr and cross-Kerr coefficients). To experimentally study the electrodynamics of grAl thin films, we measure microwave resonators with open-boundary conditions and test the theoretical predictions in two limits.

[Effect of vilon on the immunity status and coagulation hemostasis in patients of different age with diabetes mellitus].

Improving the status of elderly patients with diabetes mellitus is an important issue of gerontology and geriatrics. This work was aimed at the study of the effect of thymomimetic Vilon on the immune status and coagulation hemostasis in elderly patients with type I diabetes mellitus. It was found that the administration of Vilon as an addition to the complex therapy for this cohort of patients resulted in optimization of coagulation hemostasis, which was manifested in the increased content of natural anticoagulants: antithrombin III and protein C, as well as in the stimulation of fibrinolysis.