Superconducting quantum interference devices, or SQUIDs, are usually used as high-sensitivity magnetic-field detectors. Embedding bar resonators into them could enable this sensitivity to be exploited for displacement measurements at the quantum limit.
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Blencowe, M. SQUIDs at the limit. Nature Phys 4, 753–754 (2008). https://doi.org/10.1038/nphys1086
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DOI: https://doi.org/10.1038/nphys1086
