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Schematic of the device. The main part is the central transformer, modified by an inner dc-SQUID of small inductance; the coordinates are the magnetic fluxes and . A signal flux is applied on the left side and the response is read out by the SQUID on the right side. The control on the transmitted flux is achieved by coupling a flux to the inner dc-SQUID.
(a) Experimental curves showing the flux characteristics of the device for values of the control magnetic flux in the range 0.38–0.62 . is the flux seen by the readout magnetometer; (b) data corrected by removing the effect of spurious couplings.
Experimental values of the slope of the flux characteristics at the working point (zero input flux), plotted against the value of the control flux, coupled to the inner dc-SQUID. The continuous line is the best fit with Eq. (3), also considering the spurious direct coupling between input and output.
Modulation of a sinusoidal signal fed to one side of the tunable transformer. The ratio of the transmitted amplitude between the on and off states is 30.
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