Abstract
In nature one observes that in three space dimensions particles are either symmetric under interchange (bosons) or antisymmetric (fermions). These phases give rise to the two possible “statistics” that one observes. In two dimensions, however, a whole continuum of phases is possible. “Anyon” is a term coined in by Frank Wilczek to describe particles in 2 dimensions that can acquire “any” phase when two or more of them are interchanged. The exchange of two such anyons can be expressed via representations of the braid group and hence, it permits one to encode information in topological features of a system composed of many anyons. Kitaev suggested the possibility that such topological excitations would be stable and could thus be used for robust quantum computation.
This paper aims to
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1.
give the categorical structure necessary to describe such a computing process;
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illustrate this structure with a concrete example namely: Fibonacci anyons.
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Notes
- 1.
To a mathematician this is part of the definition of Hilbert space. However, there have been proposals in physics to consider analogues of Hilbert spaces with an indefinite metric. In the physics literature these are sometimes also called “Hilbert spaces.”
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Indeed, the braid group is not sufficient as anyons are extended objects. We need to have ribbons (or framed) strands to adequately represent all movements such as, for instance, a rotation of an anyon by 2π.
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Being symmetric means that the braiding σ is such that \(\sigma_{B,A}\sigma_{A,B}=1_{A\otimes B}\) for all A and B.
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Sometimes called a tortile category.
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Of course, this is an approximation in the effective field theory of these excitations.
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Such a space is also called a fusion space however, as the initialisation of a state takes place via a splitting, we prefer our proposed terminology.
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Strictly speaking, it is a biproduct of fusion spaces but as the later is simultaneously a product and a coproduct, it also makes sense to speak of tuples.
- 9.
This algebra is defined as \(K(\textbf{C})\otimes_{\mathbb{Z}}\mathbb{K}\) where K(C) is the Grothendieck ring of C. See for instance [5] p. 32 and 53–54.
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Acknowledgement
The authors would like to thank Samson Abramsky, Michel Boyer, Ross Duncan, Rafael Sorkin, Colin Stephen, Benoît Valiron and Jamie Vicary for useful discussions.
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Panangaden, P., Paquette, É. (2010). A Categorical Presentation of Quantum Computation with Anyons. In: Coecke, B. (eds) New Structures for Physics. Lecture Notes in Physics, vol 813. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-12821-9_15
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