Suppressing quasiparticle poisoning with a voltage-controlled filter

Gerbold Menard; Filip Malinowski; Denise Puglia; Dmitry, I Pikulin; Torsten Karzig; Bela Bauer; Peter Krogstrup; Charles Marcus

doi:10.1103/PhysRevB.100.165307

Suppressing quasiparticle poisoning with a voltage-controlled filter

Gerbold Menard, Filip Malinowski, Denise Puglia, Dmitry, I Pikulin, Torsten Karzig, Bela Bauer, Peter Krogstrup, Charles Marcus

Condensed Matter Physics

4 Citations (Scopus)

Abstract

We study single-electron charging events in an Al/InAs nanowire hybrid system with deliberately introduced gapless regions. The occupancy of a Coulomb island is detected using a nearby radio-frequency quantum dot as a charge sensor. We demonstrate that a 1-μm-long gapped segment of the wire can be used to efficiently suppress single electron poisoning of the gapless region and therefore protect the parity of the island while maintaining good electrical contact with a normal lead. In the absence of protection by charging energy, the 1e switching rate can be reduced below Γ=200s-1. In the same configuration, we observe strong quantum charge fluctuations due to the exchange of electron pairs between the island and the lead. The magnetic-field dependence of the poisoning rate yields a zero-field superconducting coherence length of ζ=90±10 nm.

Original language	English
Article number	165307
Journal	Physical Review B
Volume	100
Issue number	16
Number of pages	12
ISSN	2469-9950
DOIs	https://doi.org/10.1103/PhysRevB.100.165307
Publication status	Published - 29 Oct 2019

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10.1103/PhysRevB.100.165307

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title = "Suppressing quasiparticle poisoning with a voltage-controlled filter",

abstract = "We study single-electron charging events in an Al/InAs nanowire hybrid system with deliberately introduced gapless regions. The occupancy of a Coulomb island is detected using a nearby radio-frequency quantum dot as a charge sensor. We demonstrate that a 1-μm-long gapped segment of the wire can be used to efficiently suppress single electron poisoning of the gapless region and therefore protect the parity of the island while maintaining good electrical contact with a normal lead. In the absence of protection by charging energy, the 1e switching rate can be reduced below Γ=200s-1. In the same configuration, we observe strong quantum charge fluctuations due to the exchange of electron pairs between the island and the lead. The magnetic-field dependence of the poisoning rate yields a zero-field superconducting coherence length of ζ=90±10 nm.",

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T1 - Suppressing quasiparticle poisoning with a voltage-controlled filter

AU - Menard, Gerbold

AU - Malinowski, Filip

AU - Puglia, Denise

AU - Pikulin, Dmitry, I

AU - Karzig, Torsten

AU - Bauer, Bela

AU - Krogstrup, Peter

AU - Marcus, Charles

PY - 2019/10/29

Y1 - 2019/10/29

N2 - We study single-electron charging events in an Al/InAs nanowire hybrid system with deliberately introduced gapless regions. The occupancy of a Coulomb island is detected using a nearby radio-frequency quantum dot as a charge sensor. We demonstrate that a 1-μm-long gapped segment of the wire can be used to efficiently suppress single electron poisoning of the gapless region and therefore protect the parity of the island while maintaining good electrical contact with a normal lead. In the absence of protection by charging energy, the 1e switching rate can be reduced below Γ=200s-1. In the same configuration, we observe strong quantum charge fluctuations due to the exchange of electron pairs between the island and the lead. The magnetic-field dependence of the poisoning rate yields a zero-field superconducting coherence length of ζ=90±10 nm.

AB - We study single-electron charging events in an Al/InAs nanowire hybrid system with deliberately introduced gapless regions. The occupancy of a Coulomb island is detected using a nearby radio-frequency quantum dot as a charge sensor. We demonstrate that a 1-μm-long gapped segment of the wire can be used to efficiently suppress single electron poisoning of the gapless region and therefore protect the parity of the island while maintaining good electrical contact with a normal lead. In the absence of protection by charging energy, the 1e switching rate can be reduced below Γ=200s-1. In the same configuration, we observe strong quantum charge fluctuations due to the exchange of electron pairs between the island and the lead. The magnetic-field dependence of the poisoning rate yields a zero-field superconducting coherence length of ζ=90±10 nm.

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DO - 10.1103/PhysRevB.100.165307

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VL - 100

JO - Physical Review B

JF - Physical Review B

IS - 16

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ER -

Suppressing quasiparticle poisoning with a voltage-controlled filter

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