Multiple quantum flux penetration in superconducting loops

Flux penetration in a superconducting strip with an edge indentation

The flux penetration near a semicircular indentation at the edge of a thin superconducting strip placed in a transverse magnetic field is investigated. The flux front distortion due to the indentation is calculated numerically by solving the Maxwell equations with a highly nonlinear E j law. We find that the excess penetration can be significantly 50% larger than the indentation radius r0, in c...

Magnetic Flux Periodicity of h/e in Superconducting Loops

Nonlocality and Magnetic Flux Sensitivity of Superconducting Mesoscopic Aluminium Loops

We have measured the magnetoresistance and the magnetic phase boundaries T,(B) of mesoscopic superconducting structures containing an A1 loop. The structures were designed to study the nonlocal interaction between the loop and the electrical leads connected to it. Several voltage probes have been attached to the current leads to monitor the superconducting transitions of both the loop and the s...

Flux-based superconducting qubits for quantum computation

Superconducting quantum circuits have been proposed as qubits for developing quantum computation. The goal is to use superconducting quantum circuits to model the measurement process, understand the sources of decoherence, and to develop scalable algorithms. A particularly promising feature of using superconducting technology is the potential of developing high-speed, on-chip control circuitry ...

Flux Exclusion Superconducting Quantum Metamaterial: Towards Quantum-level Switching

Nonlinear and switchable metamaterials achieved by artificial structuring on the subwavelength scale have become a central topic in photonics research. Switching with only a few quanta of excitation per metamolecule, metamaterial's elementary building block, is the ultimate goal, achieving which will open new opportunities for energy efficient signal handling and quantum information processing....