A comparative study of reversible circuits using QDCA and formulation of new universal reversible gate
S. P. Ghosal, Kaushik Chakraborty, Barnik Mandal · 2016
A garbage output is an output that is needed to change an irreversible gate to a reversible one and are not used to the input to the other gates. 2.3 Quantum cost All reversible 1 × 1 and 2 × 2 gates have unity quantum cost. As every reversible gate is a combination of 1 × 1 or 2 × 2 quantum gate, so the quantum cost of a reversible gate is the numbers of quantum gate (Thapliyal et al. 2010).