Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 16: Quantum Optics III
Q 16.4: Vortrag
Dienstag, 24. März 2015, 11:45–12:00, C/HSO
Giant twin-beam generation along the pump energy propagation — •Kirill Spasibko1,2,3, Angela Pérez1,2, Polina Sharapova3, Olga Tikhonova3, Maria Chekhova1,2,3, and Gerd Leuchs1,2 — 1Max Planck Institute for the Science of Light, 91058 Erlangen, Germany — 2Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany — 3Department of Physics, M.V.Lomonosov Moscow State University, 119991 Moscow, Russia
Twin-beam squeezed vacuum state is a very exciting non-classical state of light. In theory, it exhibits perfect photon-number correlation between the beams, so that with this state even the Bell's inequalities could be, in principle, violated. On the other hand, this state can be macroscopic, therefore light-light and light-matter interactions would be much more efficient with it.
Unfortunately generation of bright twin beams requires using of short pump pulses or tight focusing. In this case the effects of transverse (spatial) and longitudinal (temporal) walk-off appear in the nonlinear medium. This limits the generation of bright twin beams.
In this work we have shown that extremely bright twin beams can be generated via high-gain parametric down conversion if one of the twin beams is emitted along the pump Poynting vector or its group velocity matches that of the pump. Moreover, we have shown that effects of spatial and temporal walk-off can be useful for the shaping of the emitted twin beams, especially for the reduction of their number of spatial and temporal modes.