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Spectral response of Josephson junctions with low-energy quasiparticles
by Anna Keselman, Chaitanya Murthy, Bernard van Heck, Bela Bauer
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Submission summary
Authors (as registered SciPost users): | Anna Keselman · Chaitanya Murthy · Bernard van Heck |
Submission information | |
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Preprint Link: | scipost_201906_00002v1 (pdf) |
Date accepted: | Oct. 1, 2019 |
Date submitted: | June 19, 2019, 2 a.m. |
Submitted by: | Keselman, Anna |
Submitted to: | SciPost Physics |
Ontological classification | |
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Academic field: | Physics |
Specialties: |
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Approaches: | Theoretical, Computational |
Abstract
We study nanowire-based Josephson junctions shunted by a capacitor and take into account the presence of low-energy quasiparticle excitations. These are treated by extending conventional models used to describe superconducting qubits to include the coherent coupling between fermionic quasiparticles, in particular the Majorana zero modes that emerge in topological superconductors, and the plasma mode of the junction. Using accurate, unbiased matrix-product state techniques, we compute the energy spectrum and response function of the system across the topological phase transition. Furthermore, we develop a perturbative approach, valid in the harmonic limit with small charging energy, illustrating how the presence of low-energy quasiparticles affects the spectrum and response of the junction. Our results are of direct interest to on-going experimental investigations of nanowire-based superconducting qubits.
Published as SciPost Phys. 7, 050 (2019)
Reports on this Submission
Report #1 by Anonymous (Referee 1) on 2019-8-19 (Invited Report)
- Cite as: Anonymous, Report on arXiv:scipost_201906_00002v1, delivered 2019-08-19, doi: 10.21468/SciPost.Report.1120
Strengths
(2) The authors' numerical approach allows for an easy extension to realistic models which would help the ongoing experimental effort.
(3) Simple analytical models that help clarify the physics coming out of the numerical simulations.
(4) Clear introduction and exposition; I enjoyed reading it.
Weaknesses
Report
Requested changes
Fig 3c: supply legend for the colored-dashed lines
I would like to ask the authors to consider publishing their code.