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Résumé |
Superconducting circuit quantum electrodynamics (circuit QED) is one of the most promising platforms for
quantum information processing. In typical circuit QED experiments, the quantum state of the qubit is
measured by monitoring a readout resonator weakly and off-resonantly coupled to the qubit. As drive power
is increased to achieve a higher fidelity and faster measurement, unwanted transitions occur, which, for
example, decrease the qubit’s energy relaxation time T1 . In this talk, focusing on the ubiquitously used
transmon qubits, we address the phenomenon of escape into unconfined states [1,2], and unveil a mechanism
for rate enhancement during measurement: by interactions between the low-lying states defining the qubit
subspace and high-energy chaotic states [3]. This analysis can help impose parameter constraints in current
experiments.
[1] L. Verney, R. Lescanne, M. H. Devoret, Z. Leghtas, and M. Mirrahimi, Phys. Rev. Applied 11, 024003 (2019)
[2] R. Shillito, A. Petrescu, J. Cohen, J. Beall, M. Hauru, M. Ganahl, A. G. M. Lewis, G. Vidal, and A. Blais,
“Dynamics of transmon ionization” arXiv: 2203.11235 (2022).
[3] J. Cohen, A. Petrescu, R. Shillito, A. Blais, “Reminiscence of chaos in driven transmons” arXiv:2207.09361 |
