Extended Data Fig. 2: Coherence time.
From: Realization of a fractional quantum Hall state with ultracold atoms
a, Long-term evolution of an atom under 1D Raman tunnelling. The atom initially occupies site 0. The tunnelling along x is set to K/2π = 13 Hz (smaller than for the main measurements) and the tilt along x is Δx/2π = 40 Hz per site. The tilt leads to a rephasing of the quantum walk and converts it to Bloch oscillations, which show coherent revivals after the evolution times of 500 ms. The evolution is in agreement with a fit to the data, which incorporates decoherence through the Monte Carlo wavefunction technique. b, Cut through the data in a of the initial site 0. The fit result (solid line) yields a decay rate of τRaman = 1.25(7) s. Error bars denote the s.e.m.
