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- Strong Coupling of a Quantum Oscillator to a Flux Qubit at Its Symmetry Point
Strong Coupling of a Quantum Oscillator to a Flux Qubit at Its Symmetry Point
in: Physical Review Letters (2010)
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 vosc we find the largest vacuum Rabi splitting of ~0.1vosc. Here being at resonance coincides with the optimal coherence of the symmetry point.