Transmission of Microwaves Through the Quantum Metamaterial in Different Regimes (IMAGE)
Caption
a The measured dependence of the amplitude of transmission coefficient t (normalized to the value at zero field) on applied dc magnetic field (proportional to the bias current in the coil, lower axis) and frequency f. The upper horizontal axis translates the field in magnetic flux Φ per qubit single loop. The transmission t displays the sharp changes under variation of the magnetic flux Φ. One can see two different ranges of microwave propagation, nearly flat transmission around zero field and sharp resonant enhancement of the transmission near 11-14?GHz at magnetic flux Φ?~?±Φ0/2. b A cross-cut of a at the fixed frequency of 13?GHz. The sharp peaks correspond to coherent tunneling between quantum states in the twin qubits (see text). c A cross-cut of a at the fixed frequency of 10?GHz. The sharp jumps correspond to a transition between zero and π phase on the central junction of the twin qubit (see text). Red curve is a fit to the theoretically predicted dependence Eq. (12)
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