Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 83: Poster: Enabling Technologies Sources of Quantum States of Light

FM 83.8: Poster

Donnerstag, 26. September 2019, 16:30–18:30, Tents

Measurement-induced effects in two-mode systems. — •Matvei Riabinin, Polina Sharapova, Tim J. Bartley, and Torsten Meier — Paderborn University, Warburger Strasse 100, D-33098 Paderborn, 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 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 as a coherent state and single photon state and apply detection to each channel. We analyze the aquired 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. It is also possible to generate quantum states similar to two-mode cat states with high fidelity. These results will be used for a theoretical description of quantum photonic chips with superconducting detectors embedded into an integrated platform.