Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 51: Quantum Optics IV

Q 51.7: Talk

Thursday, March 12, 2020, 15:30–15:45, f342

Quantum Feedback, self-stimulation and Fock State Generation — Melanie Engelkemeier¹, Ish Dhand², Evan Meyer-Scott¹, Jan Sperling¹, Sonja Barkhofen¹, •Benjamin Brecht¹, Martin Plenio², and Christine Silberhorn¹ — ¹Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn — ²Universität Ulm, Institut für Theoretische Physik, Helmholtzstraße 16, D-89081 Ulm

The generation of higher-order Fock states is important for several physical applications, such as fundamental studies of physics and quantum metrology. Usually, the means of choice to generate heralded higher-order Fock states is a dispersion-engineered parametric down conversion (PDC) process. These processes feature a high overall brightness, however the probability to generate specific higher-order Fock states decreases with increasing state size; large states are generated only at low rates. To overcome this challenge, we utilize a time-multiplexed quantum feedback, which introduces self-stimulation in the PDC process. This leads to a successive build up of higher order Fock states due to a coherent addition of photons. Therefore, within this setup, it is possible to generate higher-order Fock states with higher rates compared to a single PDC source. In this talk, we report on the current status of this project.