Discrete spectrum of measured parameters of a superconductor nanostructure

TL;DR

This paper discusses how the discrete energy spectrum in superconducting nanostructures can lead to measurable jumps in parameters like supercurrent, enabling potential applications in quantum devices.

Contribution

It proposes a device utilizing macroscopic quantum discreteness in superconducting loops to produce measurable parameter jumps with minimal external changes.

Findings

Discrete spectrum causes measurable jumps in supercurrent.

Device design leverages quantum number changes in superconducting loops.

Potential applications in quantum measurement and control.

Abstract

The discreteness of permitted state spectrum postulated on atomic level can be macroscopic in nanostructures and larger structures because of macroscopic quantum phenomena such as superconductivity. The change by jump of measured parameters because of the macroscopic discreteness may be used for some applications. A device is proposed measured parameters of which can change by jump at a weak change of external parameters. The devise consists of two superconductor loop connected with two Josephson junctions. The macroscopic parameter - maximum value of the super-current through the two Josephson junctions - can change with the quantum number determining macroscopic angular momentum of superconducting pairs in one of the two loops.