Contributed Talk: State-dependent potentials for trapped atom interferometry

Thomas Fernholz¹, Vilius Atkocius¹, Rhys Morrison¹, and Jamie Johnson¹

¹(Presenting author underlined) School of Physics & Astronomy, University of Nottingham,
NG7 2RD Nottingham, UK

Atom interferometry does not necessarily require free propagation of matterwaves, be it in free-space or along a waveguide. The example of Sagnac interferometry with fully trapped atoms in state-dependent trapping potentials [1] will be discussed, advantages and disadvantages, as well as our efforts for an
implementation. Recently, radio-frequency dressing allowed us to demonstrate state-dependent guiding of different rubidium hyperfine states in opposite directions around a closed loop on an atom chip.
Spectroscopy in such potentials is rich in detail [2], and sharp microwave transitions can be used to prepare superpositions of atoms in different trappable states. Additional dressing fields and field modulations can be used to fine-tune the relevant potentials and enhance coherence between these states.

[1] R. Stevenson et al., Sagnac Interferometry with a Single Atomic Clock, Phys. Rev. Lett. 115, 163001 (2015).
[2] G. A. Sinuco-Leon et al., Microwave spectroscopy of radio-frequency-dressed 87Rb, Phys. Rev. A 100, 053416 (2019)