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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster III

Q 42.31: Poster

Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof

Multimode squeezed states in coherent optical time-frequency networks — •Patrick Folge, Matteo Santandrea, Michael Stefszky, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn, Germany

Linear optical quantum networks are powerful tools in modern quantum applications and have gained a lot of attention due to their role in proving quantum computational advantages. Here, we present a resource efficient method for the implementation of linear optical quantum networks in a high-dimensional time-frequency encoding. We consider a multimode squeezing source based on type-0 parametric down-conversion (PDC) in the high gain regime as the quantum input of the system. To implement a linear optical network in the frequency bin basis we consider the use of a so-called quantum pulse gate (QPG), which allows for time-frequency mode selective frequency conversion. Here, the QPG is applied to coherently filter out input bins from the multimode squeezed state and superimpose them on the output ports of the QPG. This allows for the implementation of fully programmable linear quantum networks on the frequency bin basis. Here, we present our theoretical modeling of this system by applying it to the simple case of a frequency beam splitter. In this modelling we find that wider coherent filtering of the selected bins improves the performance of the network.