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(Color online) (a) Optic microscope image of the chip with the SQIF at the center of the substrate and the two rings, inductively coupled to the SQIF, and (b) SQIF sensor with one ring. All superconducting parts, except the regions across the junctions, are covered with gold. (c) Sketch, not in scale, of the SQIF sensor. The dashed line indicates the grain boundary.
(Color online) (a) SQIF dc voltage at and vs static magnetic field (gray curve, relative to the right axis) and simultaneous measurements of the maximum amplitude of the SQIF rf voltage , induced by the rf field with and (black curve, relative to the left axis). Detection is made by spectrum analyzer in zero span mode, at and with . The level is arbitrary. (b) Modulus of the first derivative of vs static field and bias current.
(Color online) (a) Gray curve, relative to the right axis: vs ; black curve, relative to the left axis: rf voltage detected at , with a ResBW of . The level is arbitrary. The main signals were at and and the amplitudes were . (b) Modulus of the second derivative of vs static field and bias current.
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