Quantum Search Algorithm Using Quantum Bit String Comparator

摘要

In this work, a quantum circuit able to compare if two bit strings are equal or not and, in this last case, identify which of them is the largest, is proposed. It is named quantum bit string comparator. Further, we present two applications of the quantum bit string comparator working together with Grover quantum search algorithm: implementation of conditional statements in quantum algorithms and a finder of the zero of a logical function.