Parity lifetime of bound states in a proximitized semiconductor nanowire

Andrew Patrick Higginbotham; Sven Marian Albrecht; Gediminas Kirsanskas; Willy Chang; Ferdinand Kuemmeth; Peter Krogstrup; Thomas Sand Jespersen; Jesper Nygård; Karsten Flensberg; Charles M. Marcus

doi:10.1038/nphys3461

Parity lifetime of bound states in a proximitized semiconductor nanowire

Andrew Patrick Higginbotham, Sven Marian Albrecht, Gediminas Kirsanskas, Willy Chang, Ferdinand Kuemmeth, Peter Krogstrup, Thomas Sand Jespersen, Jesper Nygård, Karsten Flensberg, Charles M. Marcus

Condensed Matter Physics

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Abstract

Quasiparticle excitations can compromise the performance of superconducting devices, causing high-frequency dissipation, decoherence in Josephson qubits, and braiding errors in proposed Majorana-based topological quantum computers. Quasiparticle dynamics have been studied in detail in metallic superconductors but remain relatively unexplored in semiconductor-superconductor structures, which are now being intensely pursued in the context of topological superconductivity. To this end, we use a system comprising a gate-confined semiconductor nanowire with an epitaxially grown superconductor layer, yielding an isolated, proximitized nanowire segment. We identify bound states in the semiconductor by means of bias spectroscopy, determine the characteristic temperatures and magnetic fields for quasiparticle excitations, and extract a parity lifetime (poisoning time) of the bound state in the semiconductor exceeding 10 ms.

Original language	English
Journal	Nature Physics
Volume	11
Issue number	12
Pages (from-to)	1017-1021
Number of pages	5
ISSN	1745-2473
DOIs	https://doi.org/10.1038/nphys3461
Publication status	Published - 1 Dec 2015

Keywords

cond-mat.mes-hall
cond-mat.supr-con

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Cite this

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title = "Parity lifetime of bound states in a proximitized semiconductor nanowire",

abstract = "Quasiparticle excitations can compromise the performance of superconducting devices, causing high-frequency dissipation, decoherence in Josephson qubits, and braiding errors in proposed Majorana-based topological quantum computers. Quasiparticle dynamics have been studied in detail in metallic superconductors but remain relatively unexplored in semiconductor-superconductor structures, which are now being intensely pursued in the context of topological superconductivity. To this end, we use a system comprising a gate-confined semiconductor nanowire with an epitaxially grown superconductor layer, yielding an isolated, proximitized nanowire segment. We identify bound states in the semiconductor by means of bias spectroscopy, determine the characteristic temperatures and magnetic fields for quasiparticle excitations, and extract a parity lifetime (poisoning time) of the bound state in the semiconductor exceeding 10 ms.",

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AU - Higginbotham, Andrew Patrick

AU - Albrecht, Sven Marian

AU - Kirsanskas, Gediminas

AU - Chang, Willy

AU - Kuemmeth, Ferdinand

AU - Krogstrup, Peter

AU - Jespersen, Thomas Sand

AU - Nygård, Jesper

AU - Flensberg, Karsten

AU - Marcus, Charles M.

N1 - [QDev]

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N2 - Quasiparticle excitations can compromise the performance of superconducting devices, causing high-frequency dissipation, decoherence in Josephson qubits, and braiding errors in proposed Majorana-based topological quantum computers. Quasiparticle dynamics have been studied in detail in metallic superconductors but remain relatively unexplored in semiconductor-superconductor structures, which are now being intensely pursued in the context of topological superconductivity. To this end, we use a system comprising a gate-confined semiconductor nanowire with an epitaxially grown superconductor layer, yielding an isolated, proximitized nanowire segment. We identify bound states in the semiconductor by means of bias spectroscopy, determine the characteristic temperatures and magnetic fields for quasiparticle excitations, and extract a parity lifetime (poisoning time) of the bound state in the semiconductor exceeding 10 ms.

AB - Quasiparticle excitations can compromise the performance of superconducting devices, causing high-frequency dissipation, decoherence in Josephson qubits, and braiding errors in proposed Majorana-based topological quantum computers. Quasiparticle dynamics have been studied in detail in metallic superconductors but remain relatively unexplored in semiconductor-superconductor structures, which are now being intensely pursued in the context of topological superconductivity. To this end, we use a system comprising a gate-confined semiconductor nanowire with an epitaxially grown superconductor layer, yielding an isolated, proximitized nanowire segment. We identify bound states in the semiconductor by means of bias spectroscopy, determine the characteristic temperatures and magnetic fields for quasiparticle excitations, and extract a parity lifetime (poisoning time) of the bound state in the semiconductor exceeding 10 ms.

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Parity lifetime of bound states in a proximitized semiconductor nanowire

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Keywords

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