Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 30: Focus Session: Young Semiconductor Forum

HL 30.4: Hauptvortrag

Mittwoch, 19. März 2025, 11:15–11:45, H13

Realistic simulation of quantum emitter dynamics made easy — •Moritz Cygorek — TU Dortmund, Germany

Few-level quantum emitters such as quantum dots are a main workhorse for cutting edge research in quantum science, e.g., for nonclassical light generation. A practical challenge is the strong interaction with the physical environment such as phonons, which gives rise to a plethora of effects such as decoherence, phonon-assisted transitions, and renormalization. The intricacy of environment effects and computational challenges have in the past rendered the theoretical analysis an expert topic requiring an in-depth understanding of various theoretical methods.

Here, I demonstrate how the concept of process tensor matrix product operators (PT-MPOs) enables quick-and-easy, yet numerically exact simulations of very general open quantum systems. A computational framework is presented that can be used as a black box by the practitioner, which (i) requires no expert knowledge, (ii) leverages path integrals and tensor networks for exceptional speed and accuracy, (iii) is based on C++ for computational and memory efficiency, (iv) yet can be controlled by parameter files and requires no explicit programming, (iv) while also providing Python bindings for easy postprocessing.

Moreover, I demonstrate applications to solid-state cavity-QED relating to concrete experiments: single- and entangled photon generation, multitime correlation functions and dynamically dressed Mollow spectra, as well as phonon effects on cooperative emission and superradiance.

Keywords: Quantum dots; Solid-state cavity QED; Cooperative emission; Phonon effects; Numerical simulation