Quantum machine language and quantum computation with Josephson junctions

An implementation method of a gate in a quantum computer is studied in terms of a finite number of steps evolving in time according to a finite number of basic Hamiltonians, which are controlled by on-off switches. As a working example, the case of a particular implementation of the two qubit computer employing a simple system of two coupled Josephson junctions is considered. The binary values of the switches together with the time durations of the steps constitute the quantum machine language of the system.