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Q: Fachverband Quantenoptik und Photonik

Q 13: Posters: Quantum Optics and Photonics I

Q 13.57: Poster

Montag, 9. März 2020, 16:30–18:30, Empore Lichthof

Generating two-mode squeezing through measurement-induced nonlinearity — •Matvei Riabinin, Polina Sharapova, Tim J. Bartley, and Torsten Meier — University of Paderborn, Warburger Strasse 100, D-33098 Paderborn, Germany

In optics, nonlinear effects such as parametric down-conversion (PDC) can generate entangled states, quadrature squeezing, and other nonclassical effects. The generation of PDC typically requires strong light intensities since the efficiency of this effect is low. Another way of creating such nonlinear transformations in quantum optics is to use so-called measurement-induced nonlinearities, where nonlinear effects are acquired by applying detection. The advantage of using detection compared to PDC is that fewer incident photons are required to generate nonclassical effects, which makes detection useful at low photon number regime. Acquired effects, however, 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. We analyze the acquired nonclassical property such as two-mode squeezing at the output. We present an analytical solution for the quantum state at the output and show that detection leads to two-mode squeezing which is absent without detection. In the considered interferometer, it is also possible to generate quantum states similar to two-mode coherent state superposition with high fidelity. Also, we model potential losses inside the interferometer to analyze the possibility of the experimental implementation.