Speaker
Description
With increasing complexity of quantum-information-processing devices, testing their functionality becomes a pressing and difficult problem. "Quantum Functional Testing" refers to the decision problem of accepting or rejecting a quantum device based on specifications provided by the producer and limited experimental evidence, combined with information gathering about failure mechanisms. The decision should be reached as quickly as possible, yet with as high confidence as possible. The task is therefore fundamentally different from quantum tomography, where one seeks as complete characterization of a quantum state or a quantum channel as possible. Here we review and propose several tools and principles for quantum functional testing, ranging from the formalism of truncated moment sequences, over statistics of the lengths of measurement sequences, to automated experimental design for maximum information gain with non-greedy Bayesian parameter estimation, culminating in pattern-based functional testing of quantum memories.
