Bonn 2025 – scientific programme

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QI: Fachverband Quanteninformation

QI 22: Quantum Simulation

QI 22.1: Talk

Wednesday, March 12, 2025, 14:30–14:45, HS IV

Optimized Squeezing Source for Gaussian Boson Sampling — Kai Hong Luo, •Florian Lütkewitte, Simone Atzeni, Jan-Lucas Eickmann, Michael Stefszky, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098, Paderborn, Germany

Gaussian boson sampling (GBS) is a promising platform for demonstrating photonic quantum advantage and noisy intermediate-scale quantum computing (NISQ). The implementation requires the production of high-quality single-mode squeezed states, and furthermore, one needs reliable verification. In our system, we produce these states by interfering the modes of a decorrelated, spectrally indistinguishable two-mode squeezed state on a balanced beam-splitter. The performance of our high mean-photon-number (⟨ n ⟩ ≫ 1000) squeezing source based on potassium titanyl phosphate (KTP) is verified using various characterization methods, including correlation measurements and Hong-Ou-Mandel (HOM) interference. The advanced characterization reveals near single-spectral-mode performance (effective modes K≈ 1.1) and high spectral indistinguishability (visibility V≈ 96%), confirming the source’s suitability for use in large optical networking applications.