Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 41: Poster: Quantum Optics and Photonics II

Q 41.15: Poster

Wednesday, March 13, 2019, 16:15–18:15, S Fobau Physik

Robust holographic generation of arbitrary light patterns for quantum walk experiments — •Weiqi Zhou-Hanf, Falk-Richard Winkelmann, Andrea Alberti, Wolfgang Alt, and Dieter Meschede — Institut für Angewandte Physik, Universität Bonn, Wegelerstraße 8, 53115 Bonn

In the two-dimensional (2D) quantum-walk experiment in Bonn, we plan to study topologically protected transport of atoms along the edges separating different topological phases [1]. To realize sharp edges, we use structured intensity patterns, which are holographically projected onto the atoms trapped in a 2D state-dependent optical lattice. We have extended the popular Gerchberg-Saxton algorithm to overcome stagnation at suboptimal intensity patterns impaired by optical vortices and to suppress speckles. Computer-generated holograms corresponding to the desired intensity patterns can be calculated with high computational efficiency and the intensity patterns can be reconstructed with high fidelity. The computed holograms are tested experimentally using a phase-only spatial light modulator (10-bit LCoS in PAN configuration), which we have gamma-corrected and phase-calibrated beforehand (phase RMS ~ λ/80) using phase-shifting interferometry. [1] M.Sajid, J.K.Asbóth, D.Meschede, R.Werner, A.Alberti, Creating Floquet Chern insulators with magnetic quantum walks, 2018, arXiv:1808.08923v1