Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 59: Quantum Information: Atoms and Ions IV / Photons and Nonclassical Light II

Q 59.6: Vortrag

Freitag, 12. März 2010, 12:00–12:15, E 214

Preparation of high fidelity single photons from waveguided parametric down-conversion — •Kaisa Laiho, Katiuscia N. Cassemiro, and Christine Silberhorn — Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1/ Bau 26, D-91058 Erlangen

Single-photon sources play an important role in several quantum optical applications. Practical sources should meet the demands of high brightness, fidelity and efficiency. Parametric down-conversion offers a possibility to prepare and manipulate photonic states in a controlled way through heralding. However, spectral correlations between the twin beams and higher photon-number contributions can decrease the fidelity of the prepared single photon.

We experimentally study the suitability of a conventional waveguided PPKTP source for producing single-photon Fock states in combination with spectral filtering. The employed method enables a direct determination of the fidelity of the prepared state. We examine the spectral overlap between the heralded state and an independent reference with HOM interference. In addition, the contributions of higher photon-number components are characterized by reconstructing the statistics of the heralded state. Our results show that we prepare a single photon state with the fidelity of 78%.