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Q: Fachverband Quantenoptik und Photonik

Q 49: Poster – Photonics, Lasers, and Applications

Q 49.17: Poster

Mittwoch, 12. März 2025, 17:00–19:00, Tent

Probing quantum non-reversability in photonic waveguide systems — •Bashar Karaja, Nico Fink, Viviane Bauer, James Anglin, and Christina Jörg — Physics Department and Research Center OPTIMAS, RPTU Kaiserslautern-Landau

We investigate the onset of irreversibility in a quantum system emulating a Bose-Hubbard model with interactions [1], implemented within a photonic waveguide platform. Our goal is to uncover the origins of irreversibility at the quantum level. To address this, we prepare the system in an initial state and subject it to an adiabatic time evolution that is precisely reversed at the midpoint. Irreversibility is quantified by the system's inability to return to its initial state, despite the exact time-reversal of the system's Hamiltonian. Given that numerous studies have demonstrated the feasibility of replicating quantum-optical effects in photonic waveguide systems [2], we apply this model to a setup of two coupled Kerr-nonlinear waveguides. By gradually increasing the on-site potential difference -controlled through the waveguide radius - and reversing this process midway, we analyze the waveguide output under varying input conditions of intensity and phase distribution. Additionally, we aim to investigate the role of time-varying intensity profiles (e.g., pulses) in shaping the irreversibility threshold of the system.

[1] Bürkle, R., Vardi, A., Cohen, D. et al., Sci Rep 9, 14169 (2019).

[2] Longhi, S., Laser & Photon. Rev. 3:243-261 (2009).

Keywords: waveguides; Kerr-nonlinearity; Bose-Hubbard