Characterization of SQUID-based null detector for a quantum metrology triangle experiment

Juho Luomahaara; Antti Kemppinen; Panu Helistö; Juha Hassel

doi:10.1109/TASC.2012.2237212

Characterization of SQUID-based null detector for a quantum metrology triangle experiment

Juho Luomahaara, Antti Kemppinen, Panu Helistö, Juha Hassel

BA6208 Quantum computing hardware

Centre for Metrology and Accreditation Finland (MIKES)

Research output: Contribution to journal › Article › Scientific › peer-review

4 Citations (Scopus)

Abstract

We present characterization of a null detector designed for an experiment aimed to close the quantum metrological triangle (QMT). The device is a SQUID amplifier equipped with a large winding-ratio planar input transformer improving the current resolution. We demonstrate equivalent input current noise down to 14 fA/Hz^1/2 . Furthermore, operation in a realistic environment of a dry dilution refrigerator hosting the QMT experiment is studied. We discuss particular challenges set by such system as the cryogenics introduces relatively large magnetic interference. We present data from measurements simulating the final QMT experiment and introduce the requirements for the averaging and bias reversal.

Original language	English
Article number	1601705
Number of pages	5
Journal	IEEE Transactions on Applied Superconductivity
Volume	23
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2012.2237212
Publication status	Published - 2013
MoE publication type	A1 Journal article-refereed
Event	Applied Superconductivity Conference, ASC 2012 - Portland, United States Duration: 7 Oct 2012 → 12 Oct 2012

Keywords

quantum metrological triangle
SQUID ammeter

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10.1109/TASC.2012.2237212

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title = "Characterization of SQUID-based null detector for a quantum metrology triangle experiment",

abstract = "We present characterization of a null detector designed for an experiment aimed to close the quantum metrological triangle (QMT). The device is a SQUID amplifier equipped with a large winding-ratio planar input transformer improving the current resolution. We demonstrate equivalent input current noise down to 14 fA/Hz1/2 . Furthermore, operation in a realistic environment of a dry dilution refrigerator hosting the QMT experiment is studied. We discuss particular challenges set by such system as the cryogenics introduces relatively large magnetic interference. We present data from measurements simulating the final QMT experiment and introduce the requirements for the averaging and bias reversal.",

keywords = "quantum metrological triangle, SQUID ammeter",

author = "Juho Luomahaara and Antti Kemppinen and Panu Helist{\"o} and Juha Hassel",

note = "Project code: 72785 Project code: 4160; Applied Superconductivity Conference, ASC 2012 ; Conference date: 07-10-2012 Through 12-10-2012",

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T1 - Characterization of SQUID-based null detector for a quantum metrology triangle experiment

AU - Luomahaara, Juho

AU - Kemppinen, Antti

AU - Helistö, Panu

AU - Hassel, Juha

N1 - Project code: 72785 Project code: 4160

PY - 2013

Y1 - 2013

N2 - We present characterization of a null detector designed for an experiment aimed to close the quantum metrological triangle (QMT). The device is a SQUID amplifier equipped with a large winding-ratio planar input transformer improving the current resolution. We demonstrate equivalent input current noise down to 14 fA/Hz1/2 . Furthermore, operation in a realistic environment of a dry dilution refrigerator hosting the QMT experiment is studied. We discuss particular challenges set by such system as the cryogenics introduces relatively large magnetic interference. We present data from measurements simulating the final QMT experiment and introduce the requirements for the averaging and bias reversal.

AB - We present characterization of a null detector designed for an experiment aimed to close the quantum metrological triangle (QMT). The device is a SQUID amplifier equipped with a large winding-ratio planar input transformer improving the current resolution. We demonstrate equivalent input current noise down to 14 fA/Hz1/2 . Furthermore, operation in a realistic environment of a dry dilution refrigerator hosting the QMT experiment is studied. We discuss particular challenges set by such system as the cryogenics introduces relatively large magnetic interference. We present data from measurements simulating the final QMT experiment and introduce the requirements for the averaging and bias reversal.

KW - quantum metrological triangle

KW - SQUID ammeter

U2 - 10.1109/TASC.2012.2237212

DO - 10.1109/TASC.2012.2237212

M3 - Article

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VL - 23

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

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M1 - 1601705

T2 - Applied Superconductivity Conference, ASC 2012

Y2 - 7 October 2012 through 12 October 2012

ER -

Characterization of SQUID-based null detector for a quantum metrology triangle experiment

Abstract

Keywords

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