Quasi-ideal feedback-loop supercurrent diode

We suggest using a device called the bootstrap superconducting quantum interference device (BS SQUID) to break the reciprocity in charge transport. This device uses magnetic flux backaction to create a nonreciprocal current-voltage characteristic, which results in a supercurrent rectification coefficient of up to approximately 95%. The BS SQUID works as a quasi-ideal supercurrent diode (SD) and maintains its efficiency up to about 40% of its critical temperature. The external magnetic flux can be used to adjust or reverse the rectification polarity. Finally, we discuss the finite-voltage operation regime of the SD and present a possible application of our device as a half- and full-wave signal rectifier in the microwave regime.