Spectroscopy on two coupled flux qubits
J. B. Majer, F. G. Paauw, A. C. J. ter Haar, C. J. P. M. Harmans, J. E. Mooij
Abstract
We have performed spectroscopy measurements on two coupled flux qubits. The qubits are coupled inductively, which results in a σ1zσ2z interaction. By applying microwave radiation, we observe resonances due to transitions from the ground state to the first two excited states. From the position of these resonances as a function of the magnetic field applied we observe the coupling of the qubits. The coupling strength agrees well with calculations of the mutual inductance.
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