EVOLUTION OF A WAVE-PACKET IN A JOSEPHSON 2-JUNCTION INTERFEROMETER

A system of two Josephson junctions in a superconducting ring is studi ed. The dynamics of the system can be described adequately by the regu lar equations of quantum mechanics taking into account the change in t he external magnetic flux and the coupling with the heat reservoir. It is shown that a two-junction interferometer can be regarded as a devi ce that performs a quantum-mechanical measurement of a coordinate. (C) 1995 American Institute of Physics.