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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster IV
Q 56.15: Poster
Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster
Electromagnetically induced transparency and light storage in an atomic Mott insulator — •Ute Schnorrberger1, Jeff Thompson1, Stefan Trotzky1, Yuao Chen1, Rami Pugatch2, Nir Davidson2, Stefan Kuhr1, and Immanuel Bloch1 — 1Institut für Physik, Johannes-Gutenberg Universität, 55128 Mainz, Germany — 2Department of Physics of Complex Systems, Weizmann Institute of Science, Rohovot 76100, Israel
We observed electromagnetically induced transparency (EIT) and light storage in an atomic Mott insulator (MI). An EIT window width of about 80Hz and storage times of about 200ms were achieved.
Our system consists of ultracold 87Rb atoms in a 3D optical lattice. For storage, the atoms are prepared in a superposition of two internal states by the coupling and the probe light field. The restoring is done after the storage time, where both beams are off, by switching on the coupling beam again.
Using the differential light shift of a spatially inhomogeneous far detuned light field during the storage time we imprint a "phase gradient" across the atomic sample, resulting in controlled angular deflection of the restored light pulse.
Preparing the atomic superposition state by a two-photon RF-and MW-pulse and then using the coupling laser to read out light after some time provides us a more convenient method to study coherence times. We show the coherence times as a function of dimensionality and lattice depth and the evolution of the coherence when having singly and doubly occupied sites in the MI.