A protected vortex exciton qubit

TL;DR

This paper introduces a novel protected vortex exciton qubit, a magnetic analogue of Kitaev's current mirror qubit, aiming to enhance fault-tolerance in quantum computing by reducing electric noise susceptibility.

Contribution

It presents a new protected qubit design based on magnetic vortices, extending Kitaev's scheme for fault-tolerant quantum computation with improved noise resilience.

Findings

The proposed qubit inherits fault-tolerance from the current mirror qubit.

Magnetic noise is less problematic than electric noise in this design.

Adaptation of Kitaev's universal fault-tolerant scheme to the vortex exciton qubit.

Abstract

We propose a protected qubit which is `dual' to a suggestion of a superconducting current mirror qubit [A. Kitaev, arXiv:0609441 (2006)]. Our construction can be regarded as the magnetic analogue of Kitaev's proposal: it inherits the intrinsic fault-tolerance of the current mirror qubit, but may perform better than it in the laboratory, since magnetic noise is generally less of a problem than electric noise. We adapt the scheme for universal fault-tolerant quantum computation proposed by Kitaev to our construction.