Flux qubit on mesoscopic nonsuperconducting ring

TL;DR

This paper explores the feasibility of creating a flux qubit using a mesoscopic nonsuperconducting ring, demonstrating its potential for quantum information processing with controllable states and measurement methods.

Contribution

It introduces a novel flux qubit design based on a mesoscopic nonsuperconducting ring, detailing its two-state system, control mechanisms, and coupling methods.

Findings

Ring can be reduced to a two-state system

Qubit states manipulated by microwave pulses

Flux states measurable by SQUID magnetometer

Abstract

The possibility of making a flux qubit on nonsuperconducting mesoscopic ballistic quasi 1D ring is discussed. We showed that such ring can be effectively reduced to a two-state system with two external control parameters. The two states carry opposite persistent currents and are coupled by tunneling which leads to a quantum superposition of states. The qubit states can be manipulated by resonant microwave pulses. The flux state of the sample can be measured by a SQUID magnetometer. Two or more qubits can be coupled by the flux the circulating currents generate. The problem of decoherence is also discussed.