Dc-SQUID readout electronics with infrared remote control

It is well known that electromagnetic interferences (EMI) deteriorate the characteristics of dc SQUIDs as well as any other device based on Josephson junctions. In general a dc-SQUID electronics is made by a head, located near the device, and by a control unit, where the user can adjust the setting parameters of the device. The cables connecting the control unit and the head can be a pathway for EMI, unless careful shielding and filtering are provided. This problem is more serious in directly coupled electronics with respect to readout schemes with a cooled transformer. Here we propose an electronics where the connecting cables have been eliminated and the dparameter settings are made by a common infrared remote control (like those used for household appliances). The remote control unit can fully control the device: it is possible to choose the dc-SQUID bias current, the locking point, the operation mode (open loop or flux locked loop), and the feedback parameters.