Quantum 2025 – wissenschaftliches Programm

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TUE: Tuesday Contributed Sessions

TUE 5: QIP Certification and Benchmarking

TUE 5.3: Vortrag

Dienstag, 9. September 2025, 14:45–15:00, ZHG010

Probing Continuous Variable Quantum Interference with Photon Counting — •Fabian Schlue¹, Patrick Folge¹, Takefumi Nomura², Philip Held¹, Federico Pegoraro¹, Michael Stefszky¹, Benjamin Brecht¹, Stephen M. Barnett³, and Christine Silberhorn¹ — ¹Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Paderborn University, Paderborn, Germany — ²Department of Applied Physics, School of Engineering, The University of Tokyo, Tokyo, Japan — ³School of Physics and Astronomy, University of Glasgow, Glasgow G4 8QQ, UK

The interference of squeezed quantum states on a balanced beam splitter is the most fundamental element in hybdrid photonic quantum computing circuits such as Gaussian boson sampling, where photon counting is deployed at the output of the circuit.

We demonstrate the generation of two independent single-mode squeezed states from the interference of two modes of a two-mode squeezed state from a dispersion-engineered parametric down-conversion source on a balanced beam splitter. We measure the joint photon-number statistics by using photon-number resolved coincidence detection. If the two modes are indistinguishable, the photon statistics become decorrelated, which we prove with different statistical measures. On the other hand, partial distinguishability gives rise to a richer structure that cannot be explained in a standard single-mode picture anymore.

Our investigations shed important insight into the inner workings of hybrid quantum photonic networks with many photons.

Keywords: Photon number resolution; Hong-Ou-Mandel interference; Hybrid quantum optical system; Continuous variable quantum optics; Discrete variable quantum optics