  We construct a holographic model of superconducting quantum interference
device (SQUID) in the Einstein-Maxwell-complex scalar theory with a negative
cosmological constant. The SQUID ring consists of two Josephson junctions which
sit on two sides of a compactified spatial direction of a Schwarzschild-AdS
black brane. These two junctions interfere with each other and then result in a
total current depending on the magnetic flux, which can be deduced from the
phase differences of the two Josephson junctions. The relation between the
total current and the magnetic flux is obtained numerically.
