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26 April 2024

» arxiv » 1004.1560

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Strong Coupling of a Quantum Oscillator to a Flux Qubit at its Symmetry Point
A. Fedorov ; A. K. Feofanov ; P. Macha ; P. Forn-Díaz ; C. J. P. M. Harmans ; J. E. Mooij ;
Date:	9 Apr 2010
Abstract:	A flux qubit biased at its symmetry point shows a minimum in the energy splitting (the gap), providing protection against flux noise. We have fabricated a qubit whose gap can be tuned fast and have coupled this qubit strongly to an LC oscillator. We show full spectroscopy of the qubit-resonator system and generate vacuum Rabi oscillations. When the gap is made equal to the oscillator frequency $ u_{osc}$ we find the strongest qubit-resonator coupling ($g/hsim0.1 u_{ m osc}$). Here being at resonance coincides with the optimal coherence of the symmetry point. Significant further increase of the coupling is possible.
Source:	arXiv, 1004.1560
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