Extended Data Fig. 7: Schematic of the phase control.
From: Quantization and its breakdown in a Hubbard–Thouless pump
The back-reflected lattice beam forms a Michelson interferometer together with the reference path before the optical fibre. A linear increase in the interference phase can be realized either by linearly ramping the set-point (a) or by using a square waveform as input for the frequency modulation, which will also result in a linear phase ramp (b).
