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Exceptional points in tunable superconducting resonators

Matti Partanen, 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, and Mikko Möttönen
Phys. Rev. B 100, 134505 – Published 7 October 2019

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.

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  • Received 17 May 2019
  • Revised 9 August 2019

DOI:https://doi.org/10.1103/PhysRevB.100.134505

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Matti Partanen1,2,*, Jan Goetz1, Kuan Yen Tan1, Kassius Kohvakka1, Vasilii Sevriuk1, Russell E. Lake1,3, Roope Kokkoniemi1, Joni Ikonen1, Dibyendu Hazra1, Akseli Mäkinen1, Eric Hyyppä1, Leif Grönberg4, Visa Vesterinen1,4, Matti Silveri1,5, and Mikko Möttönen1,4,†

  • 1QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University, P.O. Box 13500, FI-00076 Aalto, Finland
  • 2Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, DE-85748 Garching, Germany
  • 3National Institute of Standards and Technology, Boulder, Colorado 80305, USA
  • 4VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044 VTT, Finland
  • 5Research Unit of Nano and Molecular Systems, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland

  • *matti.t.partanen@aalto.fi
  • mikko.mottonen@aalto.fi

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Issue

Vol. 100, Iss. 13 — 1 October 2019

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