Quantum Schemes for Distinguishing Quantum Gates

ABSTRACT Discrimination of quantum gates is fundamental to quantum computation and information. This process involves determining whether an unknown unitary gate belongs to one of two sets of quantum gates, or . In this paper, we first introduce a scheme for distinguishing between two specific single‐qubit gates. Subsequently, we present a scheme for discriminating between two particular two‐qubit gates. Both of these discrimination schemes are exact quantum algorithms.