Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 32: Poster: Ultracold Atoms, Ions and BEC (with A)
Q 32.25: Poster
Tuesday, March 24, 2015, 17:00–19:00, C/Foyer
Unbalanced homodyne detection for interaction-free measurements — •Jan Peise1, Bernd Lücke1, Luca Pezzé2, Frank Deuretzbacher3, Wolfgang Ertmer1, Jan Arlt4, Augusto Smerzi2, Luis Santos3, and Carsten Klempt1 — 1Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany — 2Istituto Nazionale di Ottica (INO), Consiglio Nazionale delle Ricerche (CNR), and European Laboratory for Non-Linear Spectroscopy (LENS), 50125 Firenze, Italy — 3Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany — 4QUANTOP, Institut for Fysik og Astronomi, Aarhus Universitet, 8000 Arhus C, Denmark
Interaction-free measurements (IFMs) permit the detection of an object without the need of any interaction with it. Existing proposals for IFMs demand a single-particle source. Here, we realize a new many-particle IFM concept based on an indirect quantum Zeno effect in an unstable spinor Bose-Einstein condensate. For IFMs, it is necessary to discriminate between zero and a finite number of particles. We overcome this considerable experimental challenge by implementing an unbalanced homodyne detection for ultracold atoms. This new technique achieves single-particle sensitivity and serves as an important tool for future experiments in the field of quantum atom optics.