According to one embodiment, an electronic circuit includes a superconducting element and a supplier. The superconducting element includes first and second conductive components. The first conductive component includes first and second ends, and a first portion. The first end is capacitively coupled to a first quantum bit having a first characteristic frequency. The second end is capacitively coupled to a second quantum bit having a second characteristic frequency. The first portion is between the first and second ends. The second conductive component includes third end and fourth ends, and a Josephson junction provided between the third and fourth ends. The fourth end is capacitively coupled to the first portion. The supplier supplies a microwave to the third end. The microwave includes one of a first, a second, or a third wave. The second wave includes fourth and fifth waves. The third wave includes sixth and seventh waves.