Parafermion braiding in fractional quantum Hall edge states with a finite chemical potential

Parafermions are non-Abelian anyons which generalize Majorana fermions and hold great promise for topological quantum computation. We study the braiding of Z2n parafermions which have been predicted to emerge as localized zero modes in fractional quantum Hall systems at filling factor ν=1/n (n odd)....

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Bibliographic Details
Published in:Physical review. B 2019-11, Vol.100 (20), p.1, Article 205424
Main Authors: Groenendijk, Solofo, Calzona, Alessio, Tschirhart, Hugo, Idrisov, Edvin G., Schmidt, Thomas L.
Format: Article
Language:English
Subjects:
Braiding
Chemical potential
Computer simulation
Fermions
Nucleation
Organic chemistry
Quantum computing
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Summary:Parafermions are non-Abelian anyons which generalize Majorana fermions and hold great promise for topological quantum computation. We study the braiding of Z2n parafermions which have been predicted to emerge as localized zero modes in fractional quantum Hall systems at filling factor ν=1/n (n odd). Using a combination of bosonization and refermionization, we calculate the energy splitting as a function of distance and chemical potential for a pair of parafermions separated by a gapped region. Braiding of parafermions in quantum Hall edge states can be implemented by repeated fusion and nucleation of parafermion pairs. We simulate the conventional braiding protocol of parafermions numerically, taking into account the finite separation and finite chemical potential. We show that a nonzero chemical potential poses challenges for the adiabaticity of the braiding process because it leads to accidental crossings in the spectrum. To remedy this, we propose an improved braiding protocol which avoids those degeneracies.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.205424