Addressing Reversibility in Quantum Devices by a Hybrid CA Approach: the JJL Case

Reversibility is a concept widely studied in several research fields. Several contributions have been provided in physics and computer science. Reversible computation is characterized by means of invertible properties [1]. Reversibility is studied in computer science also in order to design less dissipative computers. The evolution of quantum systems is described by the time evolution operator U which is unitary and invertible; therefore such systems can implement reversibility. Reversible/invertible Cellular Automata (CA) [2] are one of the most relevant reversible computational models. Here we introduce a model for a Josephson junction ladder (JJL) device addressing reversibility: it is based on a hybrid Cellular Automata Network (CAN), the CAN2 [3].