Braiding quantum circuit based on the 4 π Josephson effect

We propose a topological qubit in which braiding and readout are mediated by the 4π Majorana-Josephson effect. The braidonium device consists of three Majorana nanowires that come together to make a trijunction. In order to control the superconducting phase differences at the trijunction, the nanowi...

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Bibliographic Details
Published in:Physical review. B 2019-01, Vol.99 (3), p.1, Article 035307
Main Authors: Stenger, John P. T., Hatridge, Michael, Frolov, Sergey M., Pekker, David
Format: Article
Language:English
Subjects:
Braiding
Josephson effect
Josephson junctions
Nanowires
Quantum theory
Qubits (quantum computing)
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Summary:We propose a topological qubit in which braiding and readout are mediated by the 4π Majorana-Josephson effect. The braidonium device consists of three Majorana nanowires that come together to make a trijunction. In order to control the superconducting phase differences at the trijunction, the nanowires are enclosed in a ring made of a conventional superconductor. In order to perform initialization and readout, one of the nanowires is coupled to a fluxonium qubit through a topological Josephson junction. We analyze how flux-based control and readout protocols can be used to demonstrate braiding and qubit operation for realistic materials and circuit parameters.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.99.035307