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 = "IEEE Institute of Electrical and Electronic Engineers",
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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

    N2 - 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.

    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

    IS - 3

    ER -