Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 34: Quantum Information (Quantum Communication)
Q 34.7: Talk
Tuesday, March 6, 2018, 15:30–15:45, K 1.020
Distillation of Squeezing using an engineered downconversion source — •Thomas Dirmeier1,2, Johannes Tiedau3, Imran Khan1,2, Vahid Ansari3, Christian R. Müller1,2, Christine Silberhorn3, Christoph Marquardt1,2, and Gerd Leuchs1,2 — 1Max Planck Institut für die Physik des Lichts, Staudtstr. 2, 91058 Erlangen — 2Institut für Optik, Information und Photonik, FAU Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen — 3Integrierte Quantenoptik, Angewandte Physik, Universität Paderborn, Warburgerstr. 100, 33098 Paderborn
Squeezed states are of interest in the quantum information processing or metrology context due to their distinguished non-classical feature - the noise reduction below shot noise in one of their phase quadratures. However, they are highly susceptible to losses during transmission.
This degradation can partially be countered by using suitable measurement protocols such as squeezing distillation. Our squeezing distillation protocol is based on subtracting photons from the squeezed modes and triggering a homodyne measurement on successful subtraction events. In our experiment, we optimize the operation parameters by employing an engineered PPKTP waveguide source to generate our squeezed states. With this, our source fulfills the demands of both, photon counting and homodyne measurements: a high brightness and a well-behaved spatial and spectral mode structure.