Exceptional points in tunable superconducting resonators

Matti Partanen (Corresponding Author), Jan Goetz, Kuan Yen Tan, Kassius Kohvakka, Vasilii Sevriuk, Russell E. Lake, Roope Kokkoniemi, Joni Ikonen, Dibyendu Hazra, Akseli Mäkinen, Eric Hyyppä, Leif Grönberg, Visa Vesterinen, Matti Silveri, Mikko Möttönen (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    Superconducting quantum circuits are potential candidates to realize a large-scale quantum computer. The envisioned large density of integrated components, however, requires a proper thermal management and control of dissipation. To this end, it is advantageous to utilize tunable dissipation channels and to exploit the optimized heat flow at exceptional points (EPs). Here, we experimentally realize an EP in a superconducting microwave circuit consisting of two resonators. The EP is a singularity point of the effective Hamiltonian, and corresponds to critical damping with the most efficient heat transfer between the resonators without back and forth oscillation of energy. We observe a crossover from underdamped to overdamped coupling across the EP by utilizing photon-assisted tunneling as an in situ tunable dissipative element in one of the resonators. These methods can be used to obtain fast dissipation, for example, for initializing qubits to their ground states. In addition, these results pave the way for thorough investigation of parity-time symmetry and the spontaneous symmetry breaking at the EP in superconducting quantum circuits operating at the level of single energy quanta.

    Original languageEnglish
    Article number134505
    JournalPhysical Review B
    Volume100
    Issue number13
    DOIs
    Publication statusPublished - 7 Oct 2019
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Superconducting resonators
    Resonators
    dissipation
    resonators
    Heat transfer
    Hamiltonians
    Quantum computers
    Microwave circuits
    microwave circuits
    quantum computers
    Networks (circuits)
    Temperature control
    heat transmission
    Ground state
    broken symmetry
    crossovers
    parity
    Photons
    Damping
    damping

    Cite this

    Partanen, M., Goetz, J., Tan, K. Y., Kohvakka, K., Sevriuk, V., Lake, R. E., ... Möttönen, M. (2019). Exceptional points in tunable superconducting resonators. Physical Review B, 100(13), [134505]. https://doi.org/10.1103/PhysRevB.100.134505
    Partanen, Matti ; Goetz, Jan ; Tan, Kuan Yen ; Kohvakka, Kassius ; Sevriuk, Vasilii ; Lake, Russell E. ; Kokkoniemi, Roope ; Ikonen, Joni ; Hazra, Dibyendu ; Mäkinen, Akseli ; Hyyppä, Eric ; Grönberg, Leif ; Vesterinen, Visa ; Silveri, Matti ; Möttönen, Mikko. / Exceptional points in tunable superconducting resonators. In: Physical Review B. 2019 ; Vol. 100, No. 13.
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    title = "Exceptional points in tunable superconducting resonators",
    abstract = "Superconducting quantum circuits are potential candidates to realize a large-scale quantum computer. The envisioned large density of integrated components, however, requires a proper thermal management and control of dissipation. To this end, it is advantageous to utilize tunable dissipation channels and to exploit the optimized heat flow at exceptional points (EPs). Here, we experimentally realize an EP in a superconducting microwave circuit consisting of two resonators. The EP is a singularity point of the effective Hamiltonian, and corresponds to critical damping with the most efficient heat transfer between the resonators without back and forth oscillation of energy. We observe a crossover from underdamped to overdamped coupling across the EP by utilizing photon-assisted tunneling as an in situ tunable dissipative element in one of the resonators. These methods can be used to obtain fast dissipation, for example, for initializing qubits to their ground states. In addition, these results pave the way for thorough investigation of parity-time symmetry and the spontaneous symmetry breaking at the EP in superconducting quantum circuits operating at the level of single energy quanta.",
    author = "Matti Partanen and Jan Goetz and Tan, {Kuan Yen} and Kassius Kohvakka and Vasilii Sevriuk and Lake, {Russell E.} and Roope Kokkoniemi and Joni Ikonen and Dibyendu Hazra and Akseli M{\"a}kinen and Eric Hyypp{\"a} and Leif Gr{\"o}nberg and Visa Vesterinen and Matti Silveri and Mikko M{\"o}tt{\"o}nen",
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    Partanen, M, Goetz, J, Tan, KY, Kohvakka, K, Sevriuk, V, Lake, RE, Kokkoniemi, R, Ikonen, J, Hazra, D, Mäkinen, A, Hyyppä, E, Grönberg, L, Vesterinen, V, Silveri, M & Möttönen, M 2019, 'Exceptional points in tunable superconducting resonators', Physical Review B, vol. 100, no. 13, 134505. https://doi.org/10.1103/PhysRevB.100.134505

    Exceptional points in tunable superconducting resonators. / Partanen, Matti (Corresponding Author); Goetz, Jan; Tan, Kuan Yen; Kohvakka, Kassius; Sevriuk, Vasilii; Lake, Russell E.; Kokkoniemi, Roope; Ikonen, Joni; Hazra, Dibyendu; Mäkinen, Akseli; Hyyppä, Eric; Grönberg, Leif; Vesterinen, Visa; Silveri, Matti; Möttönen, Mikko (Corresponding Author).

    In: Physical Review B, Vol. 100, No. 13, 134505, 07.10.2019.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Lake, Russell E.

    AU - Kokkoniemi, Roope

    AU - Ikonen, Joni

    AU - Hazra, Dibyendu

    AU - Mäkinen, Akseli

    AU - Hyyppä, Eric

    AU - Grönberg, Leif

    AU - Vesterinen, Visa

    AU - Silveri, Matti

    AU - Möttönen, Mikko

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    Partanen M, Goetz J, Tan KY, Kohvakka K, Sevriuk V, Lake RE et al. Exceptional points in tunable superconducting resonators. Physical Review B. 2019 Oct 7;100(13). 134505. https://doi.org/10.1103/PhysRevB.100.134505