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Q: Fachverband Quantenoptik und Photonik
Q 2: Quantum Optics I
Q 2.5: Talk
Monday, March 5, 2018, 11:45–12:00, K 0.016
Broadening of spatial Schmidt modes for high-gain parametric down-conversion — •Gaetano Frascella1, Polina Sharapova2, Angela M. Pérez1, and Maria V. Chekhova1,3 — 1Max Planck Institute for the Science of Light, 91058 Erlangen, Germany — 2University of Padeborn, 33098 Padeborn, Germany — 3Physics Department, Moscow State University, 119991 Moscow, Russia
High-gain parametric down-conversion (PDC) is a well-known process for the production of bright squeezed vacuum (BSV) state of light, whose nonclassical features, like macroscopic photon-number entanglement, can be employed in quantum information and imaging.
The Schmidt modal decomposition is a powerful tool for the characterization of PDC's multimode structure because it offers a set of paired eigenmodes that show no correlations with other modes.
The measurement of single-shot two-dimensional far-field intensity distributions and the calculation of the covariance distribution enables the determination of the shapes and the weights of the spatial/angular Schmidt modes.
In this work, we experimentally reconstruct the spatial/angular Schmidt modes for BSV generated through high-gain PDC from a single nonlinear crystal and we show that both the angular spectrum and the Schmidt modes broaden slightly as the parametric gain increases.
This result suggests that a correction should be made to the model of gain-independent Schmidt modes.