Design of quantum cost efficient 4-bit reversible universal shift register

This paper proposed the design of quantum cost efficient 4-bit reversible universal shift register(RUSR) using existing reversible logic gates. The proposed design is very useful in quantum computing due to its low quantum cost, less no. of reversible logic gate and low garbage outputs. The quantum cost(QC), garbage output(GO), number of gates are respectively 68, 20 and 16 for proposed work.