Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology

Q 16.80: Poster

Monday, March 17, 2014, 16:30–18:30, Spree-Palais

Quantum interferometry with spinor BECs — •Daniel Linnemann, Wolfgang Müssel, Helmut Strobel, Jonas Schulz, Jiri Tomkovic, Eike Nicklas, Ion Stroescu, David B. Hume, and Markus K. Oberthaler — Kirchhoff-Institut für Physik, Heidelberg, Germany

Atom interferometry is a powerful technique for precision measurements in gravimetry, inertial sensing and atomic clocks. Improved precision can be obtained either with spin squeezed states at the input of a linear interferometer or by employing nonlinear beam splitters. We present a systematic experimental study of squeezing generation in a spinor BEC. The use of parallelized nonlinear evolution in an optical lattice allows for obtaining spin squeezing for more than 10000 atoms. Furthermore, we implement an SU(1,1) interferometer which allows for precise phase estimation even with a small average number of atoms in each arm. Its phase sensitivity, which is predicted to be at the Heisenberg limit, is experimentally characterized.