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The recently discovered superconductor MgB2, with a transition temperature of39K, has significant potential for future electronics. An essential step is theachievement of Josephson circuits, of which the superconducting quantuminterference device (SQUID) is the most important. Here, we report Josephsonquantum interference in superconducting MgB2 thin films. Modulation voltages ofup to 30 microvolt are observed in an all-MgB2 SQUID, based on focused ion beampatterned nanobridges. These bridges, with a length scale < 100 nm, haveoutstanding critical current densities of 7 x 10^6 A/cm2 at 4.2 K.Comment: submitted to Appl. Phys. Let

Superconducting quantum interference device based on MgB2 nanobridges