Ultrastrong coupling in a scalable design for circuit QED with superconducting flux qubits

Abstract

We theoretically study a circuit quantum electrodynamics architecture with superconducting flux qubits. The qubit is coupled to the transmission line resonator by an ac current originating from the current mode of the resonator. Ultrastrong coupling can be obtained by varying the capacitance between the qubit and the resonator. We propose a scalable design where the two-qubit coupling can be achieved.

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Acknowledgments

The author acknowledges the useful discussion with K. Moon. This work was partly supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-0023467) and by the IT R&D program of MOTIE/KEIT [10043464(2012)].

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Correspondence to Mun Dae Kim.

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Kim, M.D. Ultrastrong coupling in a scalable design for circuit QED with superconducting flux qubits. Quantum Inf Process 14, 3677–3691 (2015). https://doi.org/10.1007/s11128-015-1073-2

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Keywords

  • Circuit quantum electrodynamics
  • Flux qubit
  • Ultrastrong coupling
  • Scalable design