In physics, a coincidence circuit is an electronic device with one output and two (or more) inputs. The output is activated only when signals are received within a time window accepted as at the same time and in parallel at both inputs. Coincidence circuits are widely used in particle physics experiments and in other areas of science and technology. Walther Bothe shared the Nobel Prize for Physics in 1954 "for his discovery of the method of coincidence and the discoveries subsequently made by it". Bruno Rossi invented the electronic coincidence circuit for implementing the coincidence method.