Photon Counting for Bragg Spectroscopy of Quantum Gases

Details Photon Counting for Bragg Spectroscopy of Quantum Gases Photon Counting for Bragg Spectroscopy of Quantum Gases

2010-12-07

arxiv.org/abs/1012.1574v1

Physics

Condensed Matter

Quantum Gases

7 pages, 4 figures

Scientific paper

We demonstrate a photon-counting technique for detecting Bragg excitation of an ultracold gas of atoms. By measuring the response of the light field to the atoms, we derive a signal independent of traditional time-of-flight atom-imaging techniques. With heterodyne detection we achieve photon shot-noise limited detection of the amplification or depletion of one of the Bragg laser beams. Photon counting for Bragg spectroscopy will be useful for strongly interacting gases where atom-imaging detection fails. In addition, this technique provides the ability to resolve the evolution of excitations as a function of pulse duration.

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