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"Non-Abelian anyons and interferometry", Parsa Bonderson, 2012

Reviewed February 4, 2024

Citation: Bonderson, Parsa Hassan. Non-Abelian anyons and interferometry. California Institute of Technology, 2012.

Web: https://thesis.library.caltech.edu/2447/2/thesis.pdf

Tags: Expository, Modular-tensor-categories, Hardware


This PhD thesis gives a lovely introduction to anyon models. What sets this thesis apart from other introductions is the keep focus on isotopy normalization, which allows for the immediate definition of what a "physical state" is. To showcase the power of this normalization, Bonderson takes up the task of computing probabilities of seeing various results under different forms of interferometry. The ability to model interferometers, make predictions, and give both quantities and qualitative analysis of the observations one would obtain is very impressive. This is a perfect reference for the statement "the gauge-invariant phases obtained from braiding and F-moves can be observed using interferometry".

This thesis also contains several references to experimental papers which performed these sorts of special interferometric experiments, such as

> Neder, I., et al. "Unexpected behavior in a two-path electron interferometer." Physical Review Letters 96.1 (2006): 016804.
> Ji, Yang, et al. "An electronic mach-zehnder interferometer." Nature 422.6930 (2003): 415-418.

Of course, like all good ideas, this goes back to Kitaev:

> Feldman, D. E., and Alexei Kitaev. "Detecting non-Abelian statistics with an electronic Mach-Zehnder interferometer." Physical review letters 97.18 (2006): 186803.

Another nice tidbit I like from this thesis is that it gives broader context to its discussions at some key moments. For instance, he reminded the reader that the 3D world is special because the 1/r^(D-1) force law only produces stable orbits in 3D, both in classical mechanics and in relativity:

> Tangherlini, Frank R. "Schwarzschild field in n dimensions and the dimensionality of space problem." Il Nuovo Cimento (1955-1965) 27 (1963): 636-651.

There's also a nice quote by Gibbs at the beginning: “A mathematician may say anything he pleases, but a physicist must be at least partially sane.” -Josiah Willard Gibbs (1839-1903).