Tunable impedance matching for Josephson junction reflection amplifier

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

It has been recently demonstrated that a single Josephson junction with a properly engineered impedance environment can be used as a reflection amplifier approaching the quantum limit at microwave frequencies. In this article the authors describe an improved microwave setup for such a device. Voltage-tunable capacitors enable precise impedance matching across a wide range of operating points. Also, a branch-line coupler instead of a microwave circulator is used for the separation of the input and the output signals to make the system more compact and affordable. Furthermore, a custom-designed bias tee is introduced. The authors present characterization results of individual components as well as of the complete system. In particular, noise spectroscopy is used to study amplifier stability as a function of input matching.
Original languageEnglish
JournalIEEE Transactions on Applied Superconductivity
Volume23
Issue number3
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed
EventApplied Superconductivity Conference, ASC 2012 - Portland, United States
Duration: 7 Oct 201212 Oct 2012

Fingerprint

Microwave circulators
impedance matching
Microwave frequencies
Josephson junctions
Capacitors
amplifiers
Microwaves
Spectroscopy
T shape
microwaves
Electric potential
microwave frequencies
couplers
capacitors
impedance
output
electric potential
spectroscopy

Keywords

  • Impedance matching
  • Josephson effect
  • microwave amplifiers

Cite this

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title = "Tunable impedance matching for Josephson junction reflection amplifier",
abstract = "It has been recently demonstrated that a single Josephson junction with a properly engineered impedance environment can be used as a reflection amplifier approaching the quantum limit at microwave frequencies. In this article the authors describe an improved microwave setup for such a device. Voltage-tunable capacitors enable precise impedance matching across a wide range of operating points. Also, a branch-line coupler instead of a microwave circulator is used for the separation of the input and the output signals to make the system more compact and affordable. Furthermore, a custom-designed bias tee is introduced. The authors present characterization results of individual components as well as of the complete system. In particular, noise spectroscopy is used to study amplifier stability as a function of input matching.",
keywords = "Impedance matching, Josephson effect, microwave amplifiers",
author = "Visa Vesterinen and Juha Hassel and Heikki Sepp{\"a}",
year = "2013",
doi = "10.1109/TASC.2012.2227653",
language = "English",
volume = "23",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronic Engineers IEEE",
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}

Tunable impedance matching for Josephson junction reflection amplifier. / Vesterinen, Visa; Hassel, Juha; Seppä, Heikki.

In: IEEE Transactions on Applied Superconductivity, Vol. 23, No. 3, 2013.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Tunable impedance matching for Josephson junction reflection amplifier

AU - Vesterinen, Visa

AU - Hassel, Juha

AU - Seppä, Heikki

PY - 2013

Y1 - 2013

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AB - It has been recently demonstrated that a single Josephson junction with a properly engineered impedance environment can be used as a reflection amplifier approaching the quantum limit at microwave frequencies. In this article the authors describe an improved microwave setup for such a device. Voltage-tunable capacitors enable precise impedance matching across a wide range of operating points. Also, a branch-line coupler instead of a microwave circulator is used for the separation of the input and the output signals to make the system more compact and affordable. Furthermore, a custom-designed bias tee is introduced. The authors present characterization results of individual components as well as of the complete system. In particular, noise spectroscopy is used to study amplifier stability as a function of input matching.

KW - Impedance matching

KW - Josephson effect

KW - microwave amplifiers

U2 - 10.1109/TASC.2012.2227653

DO - 10.1109/TASC.2012.2227653

M3 - Article

VL - 23

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

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