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On Quantum Computation, Anyons, and Categories

Andreas R. Blass, Yuri G. Gurevich

Published Jul 20, 2015• 0 citations
OpenAlex

Abstract

We explain the use of category theory in describing certain sorts of anyons . Yoneda’s lemma leads to a simplification of that description. For the particular case of Fibonacci anyons , we also exhibit some calculations that seem to be known to the experts but not explicit in the literature.

Related papers

On quantum computation, anyons, and categories

Andreas R. Blass, Yuri G. Gurevich

We explain the use of category theory in describing certain sorts of anyons. Yoneda's lemma leads to a simplification of that description. For the particular case of Fibonacci anyons, we also exhibit some calculations that seem to be known to the experts but not explicit in the literature.

arXiv:1502.00669•Feb 2, 2015•3 citations

Essay on the categorical description of anyons

Vítor Pimentel Pereira

Anyons são partículas que vivem em duas dimensões espaciais e possuem comportamentos estatísticos intermediários entre férmions e bósons. Neste trabalho fazemos uma exposição de como anyons podem ser adequadamente descritos usando mecânica quântica básica a partir de um processo de quantização adequado. Este processo revela a conexão entre as propriedades estatísticas de anyons e as propriedades topológicas do espaço de configura- ções do sistema. Em seguida, fazemos uma introdução elementar a teoria de categorias e a usamos para construir uma descrição categorial de anyons. A descrição categorial possui utilidades para aplicação de anyons em computação quântica e, nesta linha, resolvemos um exemplo, o modelo de anyons de Fibonacci para ilustrar como esta descrição funciona e apontar suas aplicação em computação quântica com estas partículas. Por fim, seguindo a natureza ensaística deste trabalho, concluímos por levantar vários tópicos de pesquisa sobre a assunto para os quais este trabalho pode servir como um ponto de partida. Palavras-chave: Anyons. Categorias. Partículas idênticas. Anyons de Fibonacci.

•Apr 12, 2021•0 citations

A Short Guide to Anyons and Modular Functors

Simon Burton

To the working physicist, anyon theory is meant to describe certain quasi-particle excitations occurring in two dimensional topologically ordered systems. A typical calculation using this theory will involve operations such as $\otimes$ to combine anyons, $F^{abc}_{d}$ to re-associate such combinations, and $R^{ab}_c$ to commute or braid these anyons. Although there is a powerful string-diagram notation that greatly assists these manipulations, we still appear to be operating on particles arranged on a one-dimensional line, algebraically ordered from left to right. The obvious question is, where is the other dimension? The topological framework for considering these anyons as truly living in a two dimensional space is known as a modular functor, or topological quantum field theory. In this work we show how the apparently one-dimensional algebraic anyon theory is secretly the theory of anyons living in a fully two-dimensional system. The mathematical literature covering this secret is vast, and we try to distill this down into something more manageable.

arXiv:1610.05384•Oct 17, 2016•4 citations

Witness algebra and anyon braiding

Andreas Blass, Yuri Gurevich

Abstract Topological quantum computation employs two-dimensional quasiparticles called anyons. The generally accepted mathematical basis for the theory of anyons is the framework of modular tensor categories. That framework involves a substantial amount of category theory and is, as a result, considered rather difficult to understand. Is the complexity of the present framework necessary? The computations of associativity and braiding matrices can be based on a much simpler framework, which looks less like category theory and more like familiar algebra. We introduce that framework here.

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The ZX-calculus as a language for topological quantum computation

Fatimah Rita Ahmadi, Aleks Kissinger

Abstract Unitary fusion categories formalise the algebraic theory of topological quantum computation. These categories come naturally enriched in a subcategory of the category of Hilbert spaces, and by looking at this subcategory, one can identify a collection of generators for implementing quantum computation. We represent such generators for the Fibonacci and Ising models, namely the encoding of qubits and the associated braid group representations, with the ZX-calculus and show that in both cases, the Yang–Baxter equation is directly connected to an important rule in the complete ZX-calculus known as the P-rule, which enables one to interchange the phase gates defined with respect to complementary bases. In the Ising case, this reduces to a familiar rule relating two distinct Euler decompositions of the Hadamard gate as <?CDATA $\pi/2$?> π / 2 Z- and X-phase gates, whereas in the Fibonacci case, we give a previously unconsidered exact solution of the P-rule involving the Golden ratio. We demonstrate the utility of these representations by giving graphical derivations of the single-qubit braid equations for Fibonacci anyons and the single- and two-qubit braid equations for Ising anyons. We furthermore present a fully graphical procedure for simulating and simplifying braids with the ZX-representation of Fibonacci anyons.

arXiv:2211.03855•Journal of Physics A Mathematical and Theoretical•Aug 11, 2023•1 citation
Anyons são partículas que vivem em duas dimensões espaciais e possuem comportamentos estatísticos intermediários entre férmions e bósons. Neste trabalho fazemos uma exposição de como anyons podem ser adequadamente descritos usando mecânica quântica básica a partir de um processo de quantização adequado. Este processo revela a conexão entre as propriedades estatísticas de anyons e as propriedades topológicas do espaço de configura- ções do sistema. Em seguida, fazemos uma introdução elementar a teoria de categorias e a usamos para construir uma descrição categorial de anyons. A descrição categorial possui utilidades para aplicação de anyons em computação quântica e, nesta linha, resolvemos um exemplo, o modelo de anyons de Fibonacci para ilustrar como esta descrição funciona e apontar suas aplicação em computação quântica com estas partículas. Por fim, seguindo a natureza ensaística deste trabalho, concluímos por levantar vários tópicos de pesquisa sobre a assunto para os quais este trabalho pode servir como um ponto de partida. Palavras-chave: Anyons. Categorias. Partículas idênticas. Anyons de Fibonacci.
To the working physicist, anyon theory is meant to describe certain quasi-particle excitations occurring in two dimensional topologically ordered systems. A typical calculation using this theory will involve operations such as ⊗\otimes⊗ to combine anyons, FdabcF^{abc}_{d}Fdabc​ to re-associate such combinations, and RcabR^{ab}_cRcab​ to commute or braid these anyons. Although there is a powerful string-diagram notation that greatly assists these manipulations, we still appear to be operating on particles arranged on a one-dimensional line, algebraically ordered from left to right. The obvious question is, where is the other dimension? The topological framework for considering these anyons as truly living in a two dimensional space is known as a modular functor, or topological quantum field theory. In this work we show how the apparently one-dimensional algebraic anyon theory is secretly the theory of anyons living in a fully two-dimensional system. The mathematical literature covering this secret is vast, and we try to distill this down into something more manageable.
Abstract Topological quantum computation employs two-dimensional quasiparticles called anyons. The generally accepted mathematical basis for the theory of anyons is the framework of modular tensor categories. That framework involves a substantial amount of category theory and is, as a result, considered rather difficult to understand. Is the complexity of the present framework necessary? The computations of associativity and braiding matrices can be based on a much simpler framework, which looks less like category theory and more like familiar algebra. We introduce that framework here.
Abstract Unitary fusion categories formalise the algebraic theory of topological quantum computation. These categories come naturally enriched in a subcategory of the category of Hilbert spaces, and by looking at this subcategory, one can identify a collection of generators for implementing quantum computation. We represent such generators for the Fibonacci and Ising models, namely the encoding of qubits and the associated braid group representations, with the ZX-calculus and show that in both cases, the Yang–Baxter equation is directly connected to an important rule in the complete ZX-calculus known as the P-rule, which enables one to interchange the phase gates defined with respect to complementary bases. In the Ising case, this reduces to a familiar rule relating two distinct Euler decompositions of the Hadamard gate as <?CDATA π/2\pi/2π/2?> π / 2 Z- and X-phase gates, whereas in the Fibonacci case, we give a previously unconsidered exact solution of the P-rule involving the Golden ratio. We demonstrate the utility of these representations by giving graphical derivations of the single-qubit braid equations for Fibonacci anyons and the single- and two-qubit braid equations for Ising anyons. We furthermore present a fully graphical procedure for simulating and simplifying braids with the ZX-representation of Fibonacci anyons.