Arrays containing as many as 20,000 Josephson junctions have been created by physicists at CSIRO in Australia. The devices are made from a high-temperature superconductor and operate at liquid-nitrogen temperature. With further development, the devices could be used in a range of applications, including magnetic-field sensing and as radiofrequency antennas.
The devices are called superconducting quantum interference filters (SQIFs), which are 2D arrays of superconducting interference devices (SQUIDS). A SQUID itself is a loop of superconductor that is broken in two places by Josephson junctions – electrical insulators through which the superconducting current can tunnel.
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