SAMOP 2021 – scientific programme

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QI: Fachverband Quanteninformation

QI 4: Quantum Thermodynamics and Open Quantum Systems

QI 4.1: Invited Talk

Tuesday, September 21, 2021, 14:00–14:30, H3

Principles of quantum functional testing — Nadia Milazzo^1,2, Olivier Giraud², and •Daniel Braun¹ — ¹Institute for theoretical physics, University Tübingen — ²LPTMS, Université Paris-Saclay

With increasing complexity of quantum-information-processing devices, testing their functionality becomes a pressing and difficult problem. In contrast to quantum-process tomography, quantum functional testing refers to the decision problem of accepting or rejecting a device based on specifications provided by the producer and limited experimental evidence. The decision should be reached as quickly as possible, yet with as high confidence as possible. Here we review and propose several tools and principles for quantum functional testing, ranging from the formalism of truncated moment sequences, over coherent enhancement of deterministic errors, to automated experimental design for maximum information gain and non-greedy Bayesian parameter estimation. We demonstrate their usefulness at the hand of frequently encountered quantum states and channels.