Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 40: Poster: Quantum Optics and Photonics II

Q 40.19: Poster

Wednesday, March 8, 2017, 17:00–19:00, P OG2

Spin-dependent Transport of Neutral Atoms in a 2D Polarization-Synthesized Optical Lattice — •Max Werninghaus, Stefan Brakhane, Geol Moon, Gautam Ramola, Carsten Robens, Alexander Knieps, Richard Winkelmann, Wolfgang Alt, Dieter Meschede, and Andrea Alberti — Institut für angewandte Physik Bonn

Discrete time quantum walks can be realized by deterministically transporting atoms based on their internal state. We recently reported on a new scheme for the polarization synthesis of a spindependent optical lattice that overcomes limitations of previous EOM-based setups by enabling arbitrary transport distances in a single step [1]. Here, we present an implementation extending the concept of polarization-synthesized to two dimesions, allowing spin-dependent transport in x- and ydirection [2] . The polarization synthesis to create an arbitrary polarization relies on the phase - and intensity control of two independent overlapped beams of opposite circular polarization[1]. I present the experimental realization and characterization of the opto-electronic control loops relying on a digital controller which allows us to use feedforward procedures based on internal model control.
[1] C. Robens et al: Fast, high-precision optical polarization synthesizer for ultracold-atom experiments, arXiv:1608.02410 (2016)
[2] T. Groh et al: Robustness of topologically protected edge states in quantum walk experiments with neutral atoms Phys. Rev. A (editors suggestion) 94 (2016)