Anyonic interferometry without anyons: How a flux qubit can read out a topological qubit

Details Anyonic interferometry without anyons: How a flux qubit can read out a topological qubit Anyonic interferometry without anyons: How a flux qubit can read out a topological qubit

2010-05-19

arxiv.org/abs/1005.3423v3

New J. Phys. 12, 125002 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 3 figures; Added an Appendix on parity-protected single-qubit rotations; problem with Figure 3 corrected

Scientific paper

10.1088/1367-2630/12/12/125002

Proposals to measure non-Abelian anyons in a superconductor by quantum interference of vortices suffer from the predominantly classical dynamics of the normal core of an Abrikosov vortex. We show how to avoid this obstruction using coreless Josephson vortices, for which the quantum dynamics has been demonstrated experimentally. The interferometer is a flux qubit in a Josephson junction circuit, which can nondestructively read out a topological qubit stored in a pair of anyons --- even though the Josephson vortices themselves are not anyons. The flux qubit does not couple to intra-vortex excitations, thereby removing the dominant restriction on the operating temperature of anyonic interferometry in superconductors.

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