Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics III

Q 58.9: Poster

Thursday, March 14, 2019, 16:15–18:15, S Atrium Informatik

Measurement-induced nonlinearities in two-mode systems. — •Matvei Riabinin, Polina Sharapova, Tim J. Bartley, and Torsten Meier — University of Paderborn, Warburger Strasse 100, Paderborn D-33098, Germany

In optics, nonlinear effects can lead to various transformations of light. Parametric down-conversion (PDC) and Four-Wave mixing (FWM) are nonlinear effects that can generate entangled photons, quadrature squeezing and other nonclassical effects. The generation of these effects typically requires strong light intensities. Another way of creating such non-linear transformations in quantum optics is creating so-called measurement-induced nonlinearities, where nonlinear effects can be acquired by applying detection. The detection provides a photon subtraction and might result in various nonlinear transformations. The advantage of using detection compared to PDC and FWM is that fewer incident photons are required to generate nonclassical effects. However, acquired effects have a probabilistic nature. In our work, we model a two-mode interferometer where we input different states such a coherent state, a single photon state, and others and apply detection to each channel. We analyze the acquired nonclassical properties such as entanglement and two-mode squeezing at the output. With certain combinations of system parameters, the detection leads to two-mode squeezing which is absent without detection. These results will be used for a theoretical description of quantum photonic chips with superconducting detectors embedded into an integrated platform.