DYNAMICS OF SOME SINGLE FLUX QUANTUM DEVICES

In this paper and the following one, the properties of two systems operating with single flux quanta are calculated. The first system is a quantron (a one-junction interferometer) with a Josephson gate as a junction. By a proper change of its critical current in time, the switching of quantron stable states can be controlled by a small external flux much less than Qo. This "Parametric Quantron" can be used as the basic cell of a Single Quantum Logic System. The most wonderful property of this device is that the energy dissipation during one logical step (PT factor) can be much less than the thermal energy kgT and is limited by quantum effects only: PT2">02h.