Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 19: Quantum Gases: Miscellaneous
Q 19.5: Vortrag
Dienstag, 15. März 2011, 11:45–12:00, HÜL 386
Nonclassical States of Matter generated by Parametric Amplification in a Spinor BEC — •Manuel Scherer1, Bernd Lücke1, Jan Peise1, Jens Kruse1, Oliver Topic1, Frank Deuretzbacher2, Wolfgang Ertmer1, Luis Santos2, Jan Arlt3, and Carsten Klempt1 — 1Institut für Quantenoptik, Leibniz Universität Hannover — 2Institut für Theoretische Physik, Leibniz Universität Hannover — 3QUANTOP, Department of Physics and Astronomy, University of Aarhus
The two-mode Optical Parametric Amplifier is the standard tool in optics to realize number and phase squeezing in relative observables. We have shown that the spin dynamics in a Bose-Einstein condensate (BEC) with a spin degree of freedom can provide a two-mode parametric amplification of matter waves. At first, we report on the effects of phase sum squeezing on the spontaneous creation of spin patterns.
Furthermore, the created matter waves show ultralow fluctuations in the relative atom number. We observe a variance of up to 8 dB below the shot noise limit at a total particle number of more than 104 atoms. By coupling the two created clouds via microwave pulses, we construct a beam splitter for these non-classical matter waves. We report on super-Poissonian fluctuations after the beam splitter, in agreement with the large fluctuations of the conjugate variable.
In the future, a second beam splitter will allow for closing the non-classical interferometer with the prospect of a Heisenberg limited sensitivity.