Superconducting pulse conserving logic and Josephson-SRAM

Superconducting memories employing Josephson devices

Experimental super conducting Josephson devices being investigated for use in digital logic and memory circuits have been demonstrated to switch in the 10 to 100 picosecond (1 picosecond = 10-12 sec) range. Projections based on the operation of individual logic circuits indicate that they may surpass semiconductor circuits in very high performance CPU's. This potential is based on the fact that...

Applied Superconductivity: Josephson Effects and Superconducting Electronics

Thermal Activation of Superconducting Josephson Junctions

Superconducting quantum circuits (SQCs) are being explored as model systems for scalable quantum computing architectures. Josephson junctions are extensively used in superconducting quantum interference devices (SQUIDs) and in persistent-current qubit systems. Noise excitations, however, have a critical influence on their dynamics. Thus, the primary focus of this research was to investigate the...

Constants of motion for superconducting Josephson arrays

We show that series arrays of N identical overdamped Josephson junctions have extremely degenerate dynamics. In particular, we prove that such arrays have N 3 constants of motion for all N > 3. The analysis is based on a coordinate transformation that reduces the governing equations to an (N-3 ) -pa rame te r family of low-dimensional systems. In the weak-coupling limit, the reduced equations c...

Y-junction of superconducting Josephson chains

We show that, for pertinent values of the fabrication and control parameters, an attractive finite coupling fixed point emerges in the phase diagram of a Y-junction of superconducting Josephson chains. The new fixed point arises only when the dimensionless flux piercing the central loop of the network equals π and, thus, does not break time-reversal invariance; for φ 6= π, only the strongly cou...