Entanglement interferometry for precision measurement of atomic scattering properties.
We report on a matter wave interferometer realized with entangled pairs of trapped 87Rb atoms. Each pair of atoms is confined at a single site of an optical lattice potential. The interferometer is realized by first creating a coherent spin superposition of the two atoms and then tuning the interstate scattering length via a Feshbach resonance. The selective change of the interstate scattering length leads to an entanglement dynamics of the two-particle state that can be detected in a Ramsey interference experiment. This entanglement dynamics is employed for a precision measurement of atomic interaction parameters. Furthermore, the interferometer allows us to separate lattice sites with one or two atoms in a nondestructive way.
Widera
Artur
A
Ludwig-Maximilians-Universität, Schellingstrasse 4/III, 80799 Munich, Germany. widera@uni-mainz.de
Mandel
Olaf
O
Greiner
Markus
M
Kreim
Susanne
S
Hänsch
Theodor W
TW
Bloch
Immanuel
I