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Promotionsvortrag Physik: "Anwendungen von photonischen Kristallfasern mit Hohlkern in der Quantenoptik"

Jan 15
15. Januar 2021 9:00 Uhr bis 10:00 Uhr
Online Viedeokonferenz

Ankündigung des Promotionsvortrags von: Wenjia Elser

Non-classical states of light, such as squeezed states, enable a wide variety of scientific and engineering applications in optical communication, precision measurements and quantum computing. Therefore, engineering non-classical states of light in different systems for different purposes is interesting and appealing. Non-classical states can be generated from light in a coherent state or vacuum state by using certain optical nonlinear interactions. To efficiently introduce such optical nonlinear interactions, a high nonlinear coefficient of the medium and high intensity of light in the medium are the key factors, where the hollow core photonic crystal fibers filled with atomic vapor shows their great benefits.
This talk reports our approach to apply a hollow core photonic crystal fiber (HCPCF) with the goal to generate squeezed states using strong optical nonlinearities of atomic vapor. We experimentally investigated unexpected noise properties of the fiber and determined the parameter range to reduce excess noise from the fiber. Furthermore, we have filled the core of a piece of HCPCF with rubidium vapor, which provides a high nonlinearity when the confined light is on resonance with the rubidium dipole transition. Fundamentally, our planned approach relies on self-induced transparency (SIT), which offers high nonlinearity and absorption-free propagation at the same time. We have theoretically investigated SIT solitons in rubidium vapor to analyze the required parameters to achieve SIT solitons in our rubidium filled fiber.
The experimental and theoretical approach presented in the talk suggests an efficient method for generating squeezed light.

(Vortrag auf Englisch)

Dem Vortrag schließt sich eine Diskussion von 15 Minuten an. Vortrag und Diskussion sind aufgrund der momentanen Situation nicht öffentlich. Diesen Verfahrensteilen folgt ein ebenfalls nicht öffentliches Rigorosum von 45 Minuten.