Figure 1
From: Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction
Typical sample and the noise measurement setup. (a) False color scanning electron micrograph of the SQUIPT device, together with a zoomed-in view of the Cu island (green) embedded in the superconducting Al loop (brown). The Al tunnel probe (blue) contacts the middle of the proximity SNS junction. (b) Schematic view of the DC and noise measurement system in the dilution refrigerator. Fluctuations of current through the sample are converted to voltage noise at the HEMT amplifier input by a resonant circuit formed mainly by the inductors L and L l on the sample holder, and the distributed cable capacitance C coax that connects the sample to the cryogenic amplifier residing directly in the helium bath.
