Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics V

Q 62.3: Poster

Thursday, March 8, 2018, 16:15–18:15, Redoutensaal

Detecting correlations in deterministically prepared quantum states with single-atom imaging — •Andrea Bergschneider, Vincent M. Klinkhamer, Jan Hendrik W. Becher, Ralf Klemt, Gerhard Zürn, Philipp M. Preiss, and Selim Jochim — Physikalisches Institut der Universität Heidelberg

We deterministically prepare correlated quantum states consisting of few fermions in a double-well potential. A newly developed imaging scheme for fermionic Lithium allows us to detect these correlations on a single-atom level and with spin resolution.

The detection method uses fluorescence imaging at high magnetic fields where the optical transitions for the used hyperfine states are almost closed. With a high-resolution objective we detect about 20 scattered photons per atom on an EMCCD camera. This is sufficient to identify and locate single atoms. We can apply this scheme insitu or after an expansion in time-of-flight and additionally resolve the spin by subsequently adressing the different hyperfine states.

Using this, we measure the two-particle momentum correlations and thereby probe the spatial symmetry of the two-particle wavefunction. Combining momentum and insitu information, we determine a witness for mode and particle entanglement present in the system. The high contrast and the scalability of our detection technique will allow us to go beyond measuring two-particle correlations and characterize many-body quantum states.