A modified RF SQUID was used to observe the dynamical Casimir effect for the first time.
2.
Jim Zimmerman co-developed the rf SQUID ( Superconducting QUantum Interference Device ) during his tenure at Ford research lab.
3.
RF SQUIDs can work with only one Josephson junction ( superconducting tunnel junction ), which might make them cheaper to produce, but are less sensitive.