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
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 …