We have developed a new type of magnetometer consisting of a Hybrid Quantum Interference Device (HyQUID) that is set in a bi-stable state. We demonstrate its operation in a latching mode that can be employed to measure small changes in the applied flux. The device can be used to probe the flux state of a superconducting circuit using straightforward electrical resistance measurements, making it suitable as a simple qubit readout with low back-action.
@article{arxiv.2007.11125,
title = {Hybrid Quantum Interferometer in Bifurcation Mode as a Latching Quantum Readout},
author = {Connor D Shelly and Christopher Checkley and Victor T Petrashov},
journal= {arXiv preprint arXiv:2007.11125},
year = {2021}
}