AC Josephson effect

The AC Josephson effect is a phenomenon observed in superconductors, where a weak link, called a Josephson junction, allows an alternating current (AC) to flow without any voltage applied. When two superconductors are separated by an insulating layer, an oscillating supercurrent can pass through due to quantum effects. This oscillation occurs at a frequency that depends on the voltage across the junction, making it useful in applications like quantum computers and sensitive magnetometers. Essentially, it showcases how quantum mechanics enables unique electrical behaviors in superconducting materials.