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Title: Coherent Optical Transfer of Feshbach Molecules to a Lower Vibrational State

Abstract

Using the technique of stimulated Raman adiabatic passage (STIRAP) we have coherently transferred ultracold {sup 87}Rb{sub 2} Feshbach molecules into a more deeply bound vibrational quantum level. Our measurements indicate a high transfer efficiency of up to 87%. Because the molecules are held in an optical lattice with not more than a single molecule per lattice site, inelastic collisions between the molecules are suppressed and we observe long molecular lifetimes of about 1 s. Using STIRAP we have created quantum superpositions of the two molecular states and tested their coherence interferometrically. These results represent an important step towards Bose-Einstein condensation of molecules in the vibrational ground state.

Authors:
; ; ;  [1];  [2];  [1];  [3]
  1. Institut fuer Experimentalphysik, Forschungszentrum fuer Quantenphysik, Universitaet Innsbruck, 6020 Innsbruck (Austria)
  2. Debye Institute, Universiteit Utrecht, 3508 TA Utrecht (Netherlands)
  3. (Austria)
Publication Date:
OSTI Identifier:
20861640
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevLett.98.043201; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; BOSE-EINSTEIN CONDENSATION; COLLISIONS; GROUND STATES; INELASTIC SCATTERING; LIFETIME; MOLECULES; RUBIDIUM 87; VIBRATIONAL STATES

Citation Formats

Winkler, K., Lang, F., Thalhammer, G., Denschlag, J. Hecker, Straten, P. van der, Grimm, R., and Institut fuer Quantenoptik und Quanteninformation, Oesterreichische Akademie der Wissenschaften, 6020 Innsbruck. Coherent Optical Transfer of Feshbach Molecules to a Lower Vibrational State. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.043201.
Winkler, K., Lang, F., Thalhammer, G., Denschlag, J. Hecker, Straten, P. van der, Grimm, R., & Institut fuer Quantenoptik und Quanteninformation, Oesterreichische Akademie der Wissenschaften, 6020 Innsbruck. Coherent Optical Transfer of Feshbach Molecules to a Lower Vibrational State. United States. doi:10.1103/PHYSREVLETT.98.043201.
Winkler, K., Lang, F., Thalhammer, G., Denschlag, J. Hecker, Straten, P. van der, Grimm, R., and Institut fuer Quantenoptik und Quanteninformation, Oesterreichische Akademie der Wissenschaften, 6020 Innsbruck. Fri . "Coherent Optical Transfer of Feshbach Molecules to a Lower Vibrational State". United States. doi:10.1103/PHYSREVLETT.98.043201.
@article{osti_20861640,
title = {Coherent Optical Transfer of Feshbach Molecules to a Lower Vibrational State},
author = {Winkler, K. and Lang, F. and Thalhammer, G. and Denschlag, J. Hecker and Straten, P. van der and Grimm, R. and Institut fuer Quantenoptik und Quanteninformation, Oesterreichische Akademie der Wissenschaften, 6020 Innsbruck},
abstractNote = {Using the technique of stimulated Raman adiabatic passage (STIRAP) we have coherently transferred ultracold {sup 87}Rb{sub 2} Feshbach molecules into a more deeply bound vibrational quantum level. Our measurements indicate a high transfer efficiency of up to 87%. Because the molecules are held in an optical lattice with not more than a single molecule per lattice site, inelastic collisions between the molecules are suppressed and we observe long molecular lifetimes of about 1 s. Using STIRAP we have created quantum superpositions of the two molecular states and tested their coherence interferometrically. These results represent an important step towards Bose-Einstein condensation of molecules in the vibrational ground state.},
doi = {10.1103/PHYSREVLETT.98.043201},
journal = {Physical Review Letters},
number = 4,
volume = 98,
place = {United States},
year = {Fri Jan 26 00:00:00 EST 2007},
month = {Fri Jan 26 00:00:00 EST 2007}
}
  • We propose to create ultracold ground state molecules in an atomic Bose-Einstein condensate by adiabatic crossing of an optical Feshbach resonance. We envision a scheme where the laser intensity and possibly also frequency are linearly ramped over the resonance. Our calculations for {sup 87}Rb show that for sufficiently tight traps it is possible to avoid spontaneous emission while retaining adiabaticity, and conversion efficiencies of up to 50% can be expected.
  • Cited by 130
  • We report on the direct conversion of laser-cooled {sup 41}K and {sup 87}Rb atoms into ultracold {sup 41}K{sup 87}Rb molecules in the rovibrational ground state via photoassociation followed by stimulated Raman adiabatic passage. High-resolution spectroscopy based on the coherent transfer revealed the hyperfine structure of weakly bound molecules in an unexplored region. Our results show that a rovibrationally pure sample of ultracold ground-state molecules is achieved via the all-optical association of laser-cooled atoms, opening possibilities to coherently manipulate a wide variety of molecules.
  • We study the molecular behavior of two atoms interacting near a Feshbach resonance in the presence of a 1D periodic potential. The critical value of the scattering length needed to produce a molecule and the binding energy at resonance are calculated as a function of the intensity of the periodic potential. Because of the nonseparability of the center of mass and relative motion, the binding energy depends on the quasimomentum of the molecule. This has dramatic consequences on the molecular tunneling properties, which become strongly dependent on the scattering length.