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Q: Fachverband Quantenoptik und Photonik

Q 40: Quantum Optics and Nuclear Quantum Optics II

Q 40.6: Talk

Wednesday, March 12, 2025, 15:45–16:00, AP-HS

Characterization of multimode linear optical devices using single photon and two-photon correlation measurements — •Cheeranjiv Pandey, Kai Hong Luo, Simone Atzeni, Fabian Schlue, Florian Lütkewitte, Jan-Lucas Eickmann, Mikhail Roiz, Michael Stefszky, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, D-33098, Germany

Photonics has emerged as a promising platform for implementing various quantum computational and communication schemes. At the heart of many such schemes lie multimode linear optical devices, composed of integrated arrays of beam splitters and phase shifters. Previous works have demonstrated that any arbitrary unitary matrix can be decomposed into an array of beam splitters and phase shifters. Consequently, these devices can implement any unitary transformation between input and output channels by precisely controlling the beam splitters' transmittivities and the phase shifts introduced by the phase shifters. However, such devices often deviate from their ideal behavior due to fabrication imperfections and thermal cross-talk between components. As a result, precise characterization of these devices is critical to ensure their effective functionality in various applications. We showcase our ongoing research focused on developing characterization techniques that will allow us to reconstruct the transformation matrix of a multimode linear optical device by means of single-photon and two-photon correlation measurements.

Keywords: Integrated photonics; Device characterization; Quantum networks; Quantum Optics; Photonic integrated circuit