Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: HL Poster II

HL 35.50: Poster

Mittwoch, 3. April 2019, 17:30–20:00, Poster E

Factorial moments of photon-number states heralded from parametric down-conversion — •K. Laiho¹, M. Schmidt¹, G. Weihs², and S. Reitzenstein¹ — ¹Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstr. 36, 10623 Berlin, Germany — ²Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria

Well-behaved twin beams from parametric down-conversion (PDC) are routinely used for preparing single photons or other quantum optical states with higher photon numbers [1,2]. However, experimental imperfections such as optical losses both in the herald and in the target state cause degradation and it is difficult to decouple their effect, especially if losses are high. We utilize the normalized factorial moments of photon number, which can be extracted independent of losses, to characterize heralded photon-number states. With this regard, the differences between heralding with a click-detector [1] and a true photon-number resolving detector [3] can easily be visualized. Additionally, the higher-order moments provide a direct loss-tolerant access to other photon-number properties, like the parity. We investigate the boundaries for the reliability of such a state reconstruction method.
K. Laiho et al., Opt. Lett. 36, 1476 (2011).
T. Guenthner et al., J. Opt. 17, 125201 (2015).
M. Schmidt et al., J. Low Temp. Phys. 193, 1243 (2018).