arXiv:2512.19859v1 Announce Type: new
Abstract: We have realized an interferometer using a thermal cloud of magnetically trapped rubidium 87 atoms on a chip. The interferometer resembles a Ramsey interferometer with a state selective spatial splitting of the two internal states as proposed in [M. Ammar, and al., Phys. Rev. A, 91, 053623]. The splitting is effected by microwave fields from two on-chip waveguides while the atoms remain magnetically trapped. The inferred maximum separation is $1.2pm 0.1~mu$m. We observe interference fringes with a contrast around 8% limited by velocity difference of the two interferometer states when we close the interferometer. We devellop a model describing this contrast decay.