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Problem Addressed

Existing Josephson junction devices have a low operating temperature and a low frequency range. These JJs are based on niobium or niobium nitride which require cryogenic liquids to cool to operating temperatures. Niobium and niobium nitride are also costly materials which require long manufacturing times. Niobium is not naturally abundant and is also toxic. MgB2 has been studied extensively since it can function at temperatures between 20-25K using cryocoolers. Trilayer Josephson tunnel junctions using AlxOy, or AlN, as a thin tunnel barrier layer have also been reported; however, the properties of the barrier layer and the MgB2/barrier interface are not ideal because they are not well understood or difficult to control. The high cost of materials, cooling techniques, and lack of design control in existing JJs has made them difficult to commercialize.