Dhaka University Journal of Applied Science & Engineering

This paper presents a 3-Qubit quantum gate which is capable of computing all elementary 1-bit and 2-bit logical operations. The contribution of this work is in the section of obtaining classical computation via quantum principle. The proposed gate is intended to eliminate the impacts of ancillary/ garbage outputs which are introduced basically due to the limitations of implementing classical irreversible logic using reversible quantum gates. The methodology used in this purpose is dynamically changing the control and target qubits for different computational purpose. With a number of truth tables, block diagrams and logical analysis it is shown that, this gate performs classical 1-bit SET, RESET, FLIP, NULL and 2-bit AND, OR, XOR, NAND, NOR, XNOR operations with some additional properties such as level-2 FAN OUT, Universality etc. Since, gate minimization is one of the bigger challenges in quantum computation, it is anticipated that introduction, to such a gate can reduce bulks of algorithm complexity as well as explore some new dimensions of applicability.

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