A full-vortex flux qubit for charged particle optics

TL;DR

This paper presents a superconducting flux qubit design that can hold a full magnetic flux quantum, enabling potential applications in charged particle optics by leveraging collective quantum behavior of constituent qubits.

Contribution

It introduces a novel full-vortex flux qubit design with a chain of constituent qubits, advancing quantum device capabilities for charged particle optics applications.

Findings

Design achieves a flux quantum $\\phi_{0}$ in a superconducting qubit.

Interaction between constituent qubits enables collective quantum behavior.

Potential for enhanced charged particle optics applications.

Abstract

We introduce a design of a superconducting flux qubit capable of holding a full magnetic flux quantum $\phi_{0}$, which arguably is an essential property for applications in charged particle optics. The qubit comprises a row of $N$ constituent qubits, which hold a fractional magnetic flux quantum $\phi_{0}/N$. Insights from physics of the transverse-field Ising chain reveal that properly designed interaction between these constituent qubits enables their collective behavior while also maintaining the overall quantumness.