Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 40: Poster: Quantum Optics and Photonics II

Q 40.62: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG2

Direct probing of higher order Fock states — •Johannes Tiedau, Georg Harder, Vahid Ansari, Tim J. Bartley, and Christine Silberhorn — Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn

Optical quantum state characterisation is an important task for different scenarios. For many applications, particularly in protocols involving continuous variables, balanced homodyne detection is used to reconstruct a quasi-probability distribution in phase-space to describe the state. However, this method can only investigate the part of the signal field which is overlapping with a strong probe field. In contrast, using a weak local oscillator and photon counting overcomes this problem and enables us to investigate the full quantum state. Depending on the configuration, one can call this weak-field homodyne detection and or direct probing, in which the displaced parity operator of the state is measured. Since there is no intrinsic filtering during measurement, in order to see quantum effects an extremely pure quantum state is required. In our case this is achieved by precise Parametric-Down-Conversion source engineering. We report on our latest progress using this technique, namely direct probing of higher order (>=2) Fock states.