Faults are stochastic by nature while most man-made systems, and especially computers, work deterministically. This necessitates the linking of probability theory with mathematical logics, automata, and switching circuit theory. This paper provides such a connecting via quantum information theory which is an intuitive approach as quantum physics obeys probability laws. In this paper we provide a novel approach for computing diagnosis of switching circuits with gate-based quantum computers. The approach is based on the idea of putting the qubits representing faults in superposition and compute all, often exponentially many, diagnoses simultaneously. We empirically compare the quantum algorithm for diagnostics to an approach based on SAT and model-counting. For a benchmark of combinational circuits we establish an error of less than one percent in estimating the true probability of faults.

Diagnostic problem solving involves a myriad of reasoning tasks associated with the determination of diagnoses, the generation and execution of tests to discriminate diagnoses, and the determination and execution of actions to alleviate symptoms and/or their root causes. Fundamental to diagnostic problem solving is the need to reason about action and change. In this work we explore these myriad of reasoning tasks through the lens of artificial intelligence (AI) automated planning. We characterize a diversity of reasoning tasks associated with diagnostic problem solving, prove properties of these characterizations, and define correspondences with established automated planning tasks and existing state-of-the-art planning systems. In doing so, we characterize a class of epistemic planning tasks which we show can be compiled into non-epistemic planning, allowing state-of-the-art planners to compute plans for such tasks. Furthermore, we explore the effectiveness of using the conditional planner Contingent-FF with a number of diagnostic planning tasks.

Diagnostic problem solving involves a myriad of reasoning tasks associated with the determination of diagnoses, the generation and execution of tests to discriminate diagnoses, and the determination and execution of actions to alleviate symptoms and/or their root causes. Fundamental to diagnostic problem solving is the need to reason about action and change. In this work we explore these myriad of reasoning tasks through the lens of artificial intelligence (AI) automated planning. We characterize a diversity of reasoning tasks associated with diagnostic problem solving, prove properties of these characterizations, and define correspondences with established automated planning tasks and existing state-of-the-art planning systems. In doing so, we characterize a class of epistemic planning tasks which we show can be compiled into non-epistemic planning, allowing state-of-the-art planners to compute plans for such tasks. Furthermore, we explore the effectiveness of using the conditional planner Contingent-FF with a number of diagnostic planning tasks.