Journal
PHYSICAL REVIEW B
Volume 86, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.140508
Keywords
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Funding
- MEXT Kakenhi Quantum Cybernetics
- JSPS through its FIRST Program
- NICT Commissioned Research
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We demonstrate enhancement of the dispersive frequency shift in a coplanar waveguide resonator induced by a capacitively coupled superconducting flux qubit in the straddling regime. The magnitude of the observed shift, 80 MHz for the qubit-resonator detuning of 5 GHz, is quantitatively explained by the generalized Rabi model which takes into account the contribution of the qubit higher energy levels. By applying the enhanced dispersive shift to the qubit readout, we achieved 90% contrast of the Rabi oscillations, which is mainly limited by the energy relaxation of the qubit.
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