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TUE: Tuesday Contributed Sessions
TUE 5: QIP Certification and Benchmarking
TUE 5.1: Vortrag
Dienstag, 9. September 2025, 14:15–14:30, ZHG006
Photonic Fidelity Witnesses — •Riko Schadow1, Naomi Spier2, Stefan N van den Hoven2, Malaquias C Anguita2, Redlef B G Braamhaar2, Sara Marzban2, Jens Eisert1, Jelmer J Renema2, and Nathan Walk1 — 1Freie Universität Berlin — 2University of Twente
Certification and benchmarking represent a key challenge across all platforms for quantum information science and technology. A fundamental task in this regard is the verifiable creation of a particular quantum state. This can be accomplished via a fidelity witness - an empirical procedure that verifies with high probability that the experimentally prepared state has at least a certain fidelity with a desired target state. A promising avenue for experiments and applications is photonics, specifically the manipulation of photon number states through linear optics, which can directly demonstrate a quantum computational advantage via BosonSampling and, combined with adaptivity, universal, fault-tolerant quantum computation. Here, we design several sample-complexity efficient fidelity witnesses tailored to photonic systems and implement them on multi-photon entangled states generated by spontaneous parametric down-conversion sources injected into an integrated waveguide chip. We compare the witnesses in terms of required assumptions, closeness to the true fidelity and overall experimental effort. Using the best witnesses we certify sufficiently fidelities with highly entangled target states to verify the generated entanglement structure. We expect these tools to have further applications for quantum communication, computation and metrology.
Keywords: Photonics; Benchmarking; Entanglement