We report on the state of the art of quantum walk experiments with neutral atoms in state-dependent optical lattices. We demonstrate a novel state-dependent transport technique enabling the control of two spin-selective sublattices in a fully independent fashion. This transport technique allowed us to carry out a test of single-particle quantum interference based on the violation of the Leggett-Garg inequality and, more recently, to probe two-particle quantum interference effects with neutral atoms cooled into the motional ground state. These experiments lay the groundwork for the study of discrete-time quantum walks of strongly interacting, indistinguishable particles to demonstrate quantum cellular automata of neutral atoms.
@article{arxiv.1511.03569,
title = {Quantum Walks With Neutral Atoms: Quantum Interference Effects of One and Two Particles},
author = {Carsten Robens and Stefan Brakhane and Dieter Meschede and Andrea Alberti},
journal= {arXiv preprint arXiv:1511.03569},
year = {2016}
}
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Submitted to: Proceedings of 22nd International Conference on Laser Spectroscopy