Quantum 2025 – wissenschaftliches Programm
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THU: Thursday Contributed Sessions
THU 13: Poster Session: Applications
THU 13.43: Poster
Donnerstag, 11. September 2025, 16:30–18:30, ZHG Foyer 1. OG
Characterization of squeezing using higher order correlation functions — •Vladyslav Dyachuk1, Fabian Schlue1, Kai Hong Luo1, Timon Schapeler2, Michael Stefszky1, Tim Bartley2, and Christine Silberhorn1 — 1Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS),Paderborn University, Paderborn, Germany — 2Institute for Photonic Quantum Systems (PhoQS), Paderborn University, Paderborn, Germany
With the rise of photonic quantum computing systems, for example Gaussian Boson Samplers (GBS), the precise characterization of the input of a multimode field consisting of multiple unknown light sources becomes critical. In GBS, knowing the modal structure and the amount of squeezing are critical for determining system performance.
We will present a method to determine the modal structure of input light sources without the need for mode-resolved detectors such as homodyne detectors, by using photon number resolving detectors to measure higher order photon number correlation functions. We present recent state reconstruction results, from both simulations and experiment, and discuss the reliability of the results and the next steps towards realising a reliable squeezed state characterisation scheme using only photon number resolved measurements.
Keywords: Light mode reconstruction; Higher order correlation functions; PDC characterization