Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.47: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Spin waves and Collisional Frequency Shifts of Trapped-Atom Clocks — Wilfried Maineult1, Christian Deutsch2, Kurt Gibble3, Jakob Reichel2, and •Peter Rosenbusch1 — 1LNE-SYRTE, Observatoire de Paris, France — 2LKB, Ecole Normale Supérieure, Paris, France — 3Pennsylvania State University, USA
The indistinguishability of identical particles is most fundamental to quantum statistics. It imposes exchange (anti-)symmetry and leads to intriguing phenomena like Bose attraction and Pauli pressure. We study the exchange interactions in a trapped atom clock on a chip (TACC). The clock, designed to operate with magnetically trapped 87Rb atoms aims at stability 10 times better than commercial clocks.
Contrary to standard atomic clocks, where the atoms are in free flight, the trap increases the density 104× and hence the effects of interactions. In addition, we reach ultra-low temperatures, where interactions become purely s-wave. Under these ideal conditions, we have observed the opening of an energy gap between the symmetric and anti-symmetric 2-body-wavefunction describing colliding atoms. The energy gap inhibits dephasing such that extraordinarily long coherences times (58 s) can be reached [PRL 105, 020401 (2010), PRL 106, 240801 (2011)]. Here we present a direct spectroscopic measurement of the energy gap and demonstrate its inextricable link with spin waves [PRL 109, 020407 (2012)]. We also demonstrate a counter-intuitive dependence of the clock frequency on the area of the 2nd pulse in Ramsey spectroscopy. Our findings are equally relevant to optical lattice clocks and quantum information processing with small-ensemble qubits.