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Strong Coupling of a Quantum Oscillator to a Flux Qubit at Its Symmetry Point

by: A. Fedorov, A. K. Feofanov, P. Macha, P. Forn D'iaz, C. J. P. M. Harmans, J. E. Mooij
Physical Review Letters, Vol. 105 (Aug 2010), 060503, doi:10.1103/physrevlett.105.060503  Key: citeulike:11863263

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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 of which the gap can be tuned fast and have coupled this qubit strongly to an LC oscillator. We show full spectroscopy of the qubit-oscillator system and generate vacuum Rabi oscillations. When the gap is made equal to the oscillator frequency νosc we find the largest vacuum Rabi splitting of ∼0.1νosc. Here being at resonance coincides with the optimal coherence of the symmetry point.


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