A #DecisionProblem is a member of #BQP if there exists a #QuantumAlgorithm (an #algorithm that runs on a #QuantumComputer) that solves the decision problem with #HighProbability and is guaranteed to run in #PolynomialTime.
A #DecisionProblem is a member of #BQP if there exists a #QuantumAlgorithm (an #algorithm that runs on a #QuantumComputer) that solves the decision problem with #HighProbability and is guaranteed to run in #PolynomialTime.