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Title: Coherent control of ultracold collisions with chirped light: Direction matters

Abstract

We demonstrate the ability to coherently control ultracold atomic Rb collisions using frequency-chirped light on the nanosecond time scale. For certain center frequencies of the chirp, the rate of inelastic trap-loss collisions induced by negatively chirped light is dramatically suppressed compared to the case of a positive chirp. We attribute this to a fundamental asymmetry in the system: an excited wave packet moves inward on the attractive molecular potential. For a positive chirp, the resonance condition moves outward in time, while for a negative chirp, it moves inward, in the same direction as the excited wave packet; this allows multiple interactions between the wave packet and the light, enabling the wave packet to be returned coherently to the ground state. Classical and quantum calculations support this interpretation.

Authors:
; ; ;  [1]; ;  [2]
  1. Department of Physics, University of Connecticut, Storrs, Connecticut 06269 (United States)
  2. Department of Physical Chemistry and the Fritz Haber Research Center for Molecular Dynamics, The Hebrew University, 91094, Jerusalem (Israel)
Publication Date:
OSTI Identifier:
20982441
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevA.75.051401; (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; ASYMMETRY; COMPUTER CALCULATIONS; GROUND STATES; INTERACTIONS; LASER RADIATION; LOSSES; PHOTON-ATOM COLLISIONS; POTENTIALS; PULSES; RESONANCE; RUBIDIUM; TEMPERATURE RANGE 0000-0013 K; TRAPS; WAVE PACKETS

Citation Formats

Wright, M. J., Pechkis, J. A., Carini, J. L., Gould, P. L., Kallush, S., and Kosloff, R.. Coherent control of ultracold collisions with chirped light: Direction matters. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.75.051401.
Wright, M. J., Pechkis, J. A., Carini, J. L., Gould, P. L., Kallush, S., & Kosloff, R.. Coherent control of ultracold collisions with chirped light: Direction matters. United States. doi:10.1103/PHYSREVA.75.051401.
Wright, M. J., Pechkis, J. A., Carini, J. L., Gould, P. L., Kallush, S., and Kosloff, R.. Tue . "Coherent control of ultracold collisions with chirped light: Direction matters". United States. doi:10.1103/PHYSREVA.75.051401.
@article{osti_20982441,
title = {Coherent control of ultracold collisions with chirped light: Direction matters},
author = {Wright, M. J. and Pechkis, J. A. and Carini, J. L. and Gould, P. L. and Kallush, S. and Kosloff, R.},
abstractNote = {We demonstrate the ability to coherently control ultracold atomic Rb collisions using frequency-chirped light on the nanosecond time scale. For certain center frequencies of the chirp, the rate of inelastic trap-loss collisions induced by negatively chirped light is dramatically suppressed compared to the case of a positive chirp. We attribute this to a fundamental asymmetry in the system: an excited wave packet moves inward on the attractive molecular potential. For a positive chirp, the resonance condition moves outward in time, while for a negative chirp, it moves inward, in the same direction as the excited wave packet; this allows multiple interactions between the wave packet and the light, enabling the wave packet to be returned coherently to the ground state. Classical and quantum calculations support this interpretation.},
doi = {10.1103/PHYSREVA.75.051401},
journal = {Physical Review. A},
number = 5,
volume = 75,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}