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Probing the quantum state of a guided atom laser pulse
Kevin L Moore1, Subhadeep Gupta, Kater W Murch
1Department of Physics, University of California, Berkeley, California 94720, USA. klmoore@berkeley.edu
Physical Review Letters
|December 13, 2006
Summary
We developed a new spectroscopy technique to probe the quantum state of ultracold atomic beams. This method confirmed the beam
Area of Science:
- Quantum optics
- Atomic physics
- Condensed matter physics
Background:
- Characterizing quantum states of matter is crucial for advancing quantum technologies.
- Ultracold atomic beams, particularly Bose-Einstein condensates, offer unique platforms for studying quantum phenomena.
- Previous methods lacked the precision to fully map the quantum state of dispersing beams.
Purpose of the Study:
- To introduce and validate bichromatic superradiant pump-probe spectroscopy.
- To characterize the quantum state of an ultracold atomic beam within a waveguide.
- To determine the phase space area and coherence length of the atomic beam.
Main Methods:
- Utilized bichromatic superradiant pump-probe spectroscopy.
- Employed a dispersing beam of ultracold Rubidium-87 (87Rb) atoms derived from a Bose-Einstein condensate.
- Propagated the atomic beam through a 2.5 mm diameter circular waveguide.
Main Results:
- Placed an upper bound on the longitudinal phase space area of the 3 x 10(5) atom beam at 9(1) Planck's constant.
- Established a lower bound on the coherence length of the beam at >= 13(1) micrometers.
- Demonstrated the technique's ability to probe the Wigner function of a particle beam.
Conclusions:
- The measured phase space area and coherence length are consistent with full quantum degeneracy.
- The results suggest the atomic beam maintained its quantum properties after multiple orbits within the waveguide.
- Bichromatic superradiant pump-probe spectroscopy is a powerful tool for quantum state characterization.
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