Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 61: Quantum Effects (Cavity QED)

Q 61.4: Vortrag

Freitag, 15. März 2019, 11:15–11:30, S Gr. HS Maschb.

Storage and retrieval of short light pulses via fiber-based atom-cavity systems — •Tobias Macha, Wolfgang Alt, Elvira Keiler, Hannes Pfeifer, Eduardo Urunuela, and Dieter Meschede — Institut für Angewandte Physik, Bonn, Deutschland

We demonstrate the storage and retrieval of short pulses by employing a single rubidium atom coupled to a fiber-based, high-bandwidth optical resonator and an assisting control laser. In the adiabatic limit, we use optimized control pulses for single-photon generation by adapting the impedance-matching based storage scheme of Dilley et al.[1] and the concept of time-reversal symmetry. We achieve probabilities of 66 % for generating a single, arbitrarily-shaped photon into the cavity mode upon a trigger signal. Beyond the adiabatic regime, where pulse lengths approach the cavity field decay time, we determine the optimal control pulse by numerical simulations of the system via a Lindblad master equation approach. We investigate the dependence of the storage efficiency on various control pulse parameters, such as the peak amplitude or the delay with respect to the arrival of the light pulse. The successful storage of an incoming, coherent wavepacket with a temporal extent below 10 ns encourages hybrid experiments with semiconductor quantum dots as light sources. Our system offers a way to solve the bandwidth-mismatch dilemma, as previously demonstrated by Purcell broadening of the atomic emission [2].

[1] PRA 85, 023834 (2012)

[2] PRL 121, 173603 (2018)