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Inversion of Qubit Energy Levels in Qubit-Oscillator Circuits in the Deep-Strong-Coupling Regime.
Yoshihara, F; Fuse, T; Ao, Z; Ashhab, S; Kakuyanagi, K; Saito, S; Aoki, T; Koshino, K; Semba, K.
Affiliation
  • Yoshihara F; Advanced ICT Institute, National Institute of Information and Communications Technology, 4-2-1, Nukuikitamachi, Koganei, Tokyo 184-8795, Japan.
  • Fuse T; Advanced ICT Institute, National Institute of Information and Communications Technology, 4-2-1, Nukuikitamachi, Koganei, Tokyo 184-8795, Japan.
  • Ao Z; Department of Applied Physics, Waseda University, 3-4-1, Ookubo, Shinjuku-ku, Tokyo 169-8555, Japan.
  • Ashhab S; Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Qatar Foundation, Doha, Qatar.
  • Kakuyanagi K; NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan.
  • Saito S; NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan.
  • Aoki T; Department of Applied Physics, Waseda University, 3-4-1, Ookubo, Shinjuku-ku, Tokyo 169-8555, Japan.
  • Koshino K; College of Liberal Arts and Sciences, Tokyo Medical and Dental University, 2-8-30, Kounodai, Ichikawa, Chiba 272-0827, Japan.
  • Semba K; Advanced ICT Institute, National Institute of Information and Communications Technology, 4-2-1, Nukuikitamachi, Koganei, Tokyo 184-8795, Japan.
Phys Rev Lett ; 120(18): 183601, 2018 May 04.
Article in En | MEDLINE | ID: mdl-29775324
ABSTRACT
We report on experimentally measured light shifts of superconducting flux qubits deep-strongly coupled to LC oscillators, where the coupling constants are comparable to the qubit and oscillator resonance frequencies. By using two-tone spectroscopy, the energies of the six lowest levels of each circuit are determined. We find huge Lamb shifts that exceed 90% of the bare qubit frequencies and inversions of the qubits' ground and excited states when there are a finite number of photons in the oscillator. Our experimental results agree with theoretical predictions based on the quantum Rabi model.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Phys Rev Lett Year: 2018 Document type: Article
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Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Phys Rev Lett Year: 2018 Document type: Article