Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology
Q 16.88: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Collisional frequency shifts and spin-squeezing for a trapped-atom clock — •Konstantin Ott1,2, Ramon Szmuk1, Vera Guarrera1, Wilfried Maineult2, Jakob Reichel2, and Peter Rosenbusch1 — 1LNE-SYRTE, Observatoire de Paris, France — 2LKB, Ecole Normale Supérieure, Paris, France
Atomic clocks are probably the most accurate and stable instruments and lead to many scientific and technological applications. As an innovative approach we operate a trapped atom clock on a chip (TACC) using magnetically trapped 87Rb atoms.
Contrary to standard atomic clocks, where the atoms are in free flight, the trap allows reaching ultra-low temperatures and BEC, long observation times (only vacuum limited) and micro-scale positioning. It increases the density 104 × and hence the effects of interactions. Under these ideal conditions, we have observed the opening of an energy gap between the symmetric and anti-symmetric two-body-wavefunction describing colliding atoms. The energy gap inhibits dephasing such that extraordinarily long coherence times (58 s) can be reached [PRL 105, 020401 (2010), PRL 109, 020407 (2012)].
Here we present plans for a second generation set-up, now also including a microscopic optical fiber cavity [NJP 12, 065038 (2010)]. The cavity will be used for quantum non-demolition detection [PRL 104, 073604 (2010), PRL 106, 133601 (2011)] and the creation of spin-squeezing [PRL 104, 073602 (2010)]. We expect to reach clock stabilities below 10−13 at 1s, better than existing compact clocks.