Contradiction between assumption on superposition of flux-qubit states and the law of angular momentum conservation

TL;DR

This paper challenges the common assumption that flux qubits can exist in superpositions of macroscopically distinct states, arguing that such superpositions violate angular momentum conservation and fundamental quantum principles.

Contribution

It critically examines the superposition assumption in flux qubits, highlighting contradictions with angular momentum conservation and questioning the validity of their quantum description.

Findings

Superposition of flux qubit states conflicts with angular momentum conservation.

Many publications incorrectly interpret flux qubits as superpositions of macroscopically distinct states.

The paper calls for re-evaluating the quantum formalism applied to flux qubits.

Abstract

Superconducting loop interrupted by one or three Josephson junctions is considered in many publications as a possible quantum bit, flux qubit, which can be used for creation of quantum computer. But the assumption on superposition of two macroscopically distinct quantum states of superconducting loop contradict to the fundamental law of angular momentum conservation and the universally recognized quantum formalism. Numerous publications devoted to the flux qubit testify to an inadequate interpretation by many authors of paradoxical nature of superposition principle and the subject of quantum description.