Properties of two types of position-dependent electrostatic qubits: eigenenergy-based and Wannier-based, are treated with Schrodinger formalism. Their operating principles are given. The corresponding quantum universal gates for selected qubit types are described and their possible implementation is suggested. The modeling methodology of setting and reading semiconductor qubit is suggested. The interface between superconducting and semiconductor quantum computer is proposed and its implementation and operating principles are described.
The REBa2Cu3O7-δ (where RE - rare earth element, 0 < δ < 1) superconductor (also called "RE-BCO” or "1:2:3”) is produced by calcination of a mixture of copper (II) oxide (CuO), barium carbonate (BaCO3) and yttrium (III) oxide (Y2O3) powders. The aim of the research was to study similarities and differences in physico-chemical properties for ceramic samples of high-temperature superconductors slightly differing in the average crystal ionic radiuses of RE3+. For this purpose a reference sample YBa2Cu3O7-δ was prepared, for which the average crystal radius of the ion Y3+ is 104.0 pm and two samples with approximate to that average crystal ionic radiuses RE3+: HoBa2Cu3O7-δ and Er0.5Dy0.5Ba2Cu3O7-δ, where the average crystal ionic radiuses are 104.1 pm. The physicochemical properties of samples were studied and the microstructure of samples was characterized. The structural and phase homogeneity analysis was carried out using Raman spectroscopy, Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) technique. Raman measurements and XRD measurements revealed the presence of a superconducting phase in all studied samples. The granulation analysis of the mixture substrates powders after first and second calcination was performed with use of the Low-Angle Laser Light Scattering (LALLS) method. The magnetic properties of the obtained samples were measured with a SQUID magnetometer. The temperature dependences of AC susceptibility were used to determine the temperature of transition to the superconducting state and the hysteretic energy dissipation due to losses at inter-grain region.
The samples of well-oxidized REBa2Cu3O7-δ with different trivalent RE (rare earth) ions, were studied with use of EPR method at the temperature above of liquid nitrogen (77 K). The measured samples were obtained by the solid phase synthesis method. The aim of these measurements was to find and describe the relation between critical temperature, critical magnetic field, and the shape of the resonance signal. It was expected that samples possess the HTSC transition at about 90 K. For most samples, both a nonresonant absorption and emerging of HTSC state were visible in the EPR experiment. The evolution of these signals allowed determining the critical temperature, as well as the evolution of the critical magnetic fields as a function of temperature. Additionally, EPR signal of Cu (II) ions was detected and explained by insufficiently oxidized samples or the existence of contaminated phases.
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