Promotionsvortrag Physik: Tunable single photons from resonant parametric down-conversion for efficient photon-atom coupling

Apr 19
19. April 2018 10:00 - 11:00
SR 1.500, Max-Planck-Institut für die Physik des Lichts, Staudtstraße 2, Erlangen

Einladung zum Promotionsvortrag von Herrn Gerhard Schunk:
„Tunable single photons from resonant parametric down-conversion for efficient photon-atom coupling“

Today, there is not yet a source of single photons reaching the same performance as classical laser sources in the following set of important specifications: stability, compactness, efficiency, and tunability of bandwidth and center frequency. We present our compact source of photon pairs [1] and squeezed light based on efficient parametric down-conversion in a triply resonant whispering-gallery resonator (WGR) made out of lithium niobate. The central wavelength of the emitted light can be tuned over hundreds of nanometer. The tunable bandwidth of the photons resides at the MHz-scale. Our analysis of the various eigenmodes of the WGR [2] has allowed us to employ different wavelength tuning mechanisms, which we combine for continuous tuning [3]. With this we demonstrate tuning to the D1 lines of rubidium (795 nm) and cesium (895 nm) and a scanning over the Doppler-broadened and Doppler-free absorption line of the Cs D1 F4′-F3 transition. The corresponding idler photons are emitted at 1317 nm for cesium and 1609 nm for rubidium [4]. Providing this flexibility in connecting various alkali atoms with telecom wavelengths, this system opens up novel possibilities to realize proposed quantum repeater schemes.
(Vortrag auf Englisch)

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