Stuttgart 2012 – wissenschaftliches Programm
Q 34.25: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.I+II
Generation of non-classical states of matter using spinor dynamics — Bernd Lücke1, Manuel Scherer1, Jens Kruse1, Luca Pezze2, Frank Deuretzbacher3, Philipp Hyllus4, Oliver Topic1, •Jan Peise1, Wolfgang Ertmer1, Jan Arlt5, Luis Santos3, Augusto Smerzi2, and Carsten Klempt1 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Hannover, Germany — 2Istituto Nazionale di Ottica (INO), Consiglio Nazionale delle Ricerche (CNR), and European Laboratory for Non-Linear Spectroscopy (LENS), Firenze, Italy — 3Institut für Theoretische Physik, Leibniz Universität Hannover, Hannover, Germany — 4Department of Theoretical Physics, The University of the Basque Country, Bilbao, Spain — 5Center for Quantum Optics (QUANTOP), Institut for Fysik og Astronomi, Aarhus Universitet, Århus C, Denmark
In optics, parametric amplification is an important tool to generate non-classical states of light and investigate phenomena such as squeezing and entanglement. This technique can be transferred to matter-waves by using spinor dynamics in Bose-Einstein condensates. To generate non-classical states of matter we use spin changing collisions in a BEC initially prepared in the mF=0 state. These collisions may lead to the creation of correlated pairs of atoms with spin up and down (mF=±1). The pair production implies a reduced fluctuation in the population imbalance in mF=±1. We measured the corresponding variance to be well below the shot-noise limit (−6.9 dB). The measurements are in agreement with the properties of a twin-Fock state and thus point towards interferometry at the Heisenberg limit.