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Balanced coupling in electromagnetic circuits

Daniel Sank*, Mostafa Khezri, Sergei Isakov, and Juan Atalaya

  • *Contact author: sank.daniel@gmail.com
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Phys. Rev. Applied 23, 024012 – Published 5 February, 2025

DOI: https://doi.org/10.1103/PhysRevApplied.23.024012

Abstract

The rotating-wave approximation (RWA) is ubiquitous in the analysis of driven and coupled resonators. However, the limitations of the RWA seem to be poorly understood and in some cases the RWA disposes of essential physics. We investigate the RWA in the context of electrical circuits. Using a classical Hamiltonian approach, we find that by balancing electrical and magnetic components of the resonator drive or resonator-resonator coupling, the RWA can be made exact. This type of balance, in which the RWA is exact, has applications in superconducting qubits, where it suppresses nutation normally associated with strong Rabi driving. In the context of dispersive readout, balancing the qubit-resonator coupling changes the qubit leakage induced by the resonator drive but does not remove it in the case of the transmon qubit.

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Phys. Rev. Applied 23, 024012– Published 5 February, 2025
  • Received 31 May 2024
  • Revised 4 November 2024
  • Accepted 23 December 2024
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