(
Superconducting
QUantum
Interference
Device) An electronic detection system that uses Josephson junction circuits. It is capable of detecting extremely weak signals.
In 2013, D-Wave co-founder and chief scientist Eric Ladizinsky said that the SQUID was the first object to demonstrate weird quantum phenomenon at the macroscopic level rather than only the microscopic plane. For example, current in a wire can be observed moving in both directions at the same time. See
Josephson junction and
quantum computing.