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TUE: Tuesday Contributed Sessions
TUE 5: QIP Certification and Benchmarking
TUE 5.6: Talk
Tuesday, September 9, 2025, 15:30–15:45, ZHG006
SPAM-free sound certification of quantum gates via quantum system quizzing — •Nikolai Miklin1, Jan Nöller2, Martin Kliesch1, and Mariami Gachechiladze2 — 1Hamburg University of Technology — 2Technical University of Darmstadt
The rapid advancement of quantum hardware necessitates the development of reliable methods to certify its correct functioning. However, existing certification tests often fall short: they either rely on flawless state preparation and measurement, or fail to provide soundness guarantees, meaning that they do not ensure the correct implementation of the target operation by a quantum device. We introduce an approach, which we call quantum system quizzing, for certification of quantum gates in a practical server-user scenario, where a classical user tests the results of exact quantum computations performed by a quantum server. Importantly, this approach is free from state preparation and measurement (SPAM) errors. For a wide range of relevant gates, including a gate set universal for quantum computation, we demonstrate that our approach offers soundness guarantees based solely on the dimension assumption. Additionally, for a highly-relevant single-qubit phase gate - which corresponds experimentally to a pi/2-pulse - we prove that the method's sample complexity scales inverse-linearly relative to the average gate infidelity. By combining the SPAM-error-free and sound notion of certification with practical applicability, our approach paves the way for promising research into efficient and reliable certification methods for quantum computation.
Keywords: Certification; Characterization; Gates; self-testing; SPAM