Faraday spectroscopy in an optical lattice: a continuous probe of atom dynamics

The linear Faraday effect is used to implement a continuous measurement of the spin of a sample of laser-cooled atoms trapped in an optical lattice. One of the optical lattice beams serves also as a probe beam, thereby allowing one to monitor the atomic dynamics in real time and with minimal perturb...

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Published inJournal of optics. B, Quantum and semiclassical optics Vol. 5; no. 4; pp. 323 - 329
Main Authors Smith, Greg A, Chaudhury, Souma, Jessen, Poul S
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.08.2003
Institute of Physics
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ISSN1464-4266
1741-3575
DOI10.1088/1464-4266/5/4/301

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Abstract The linear Faraday effect is used to implement a continuous measurement of the spin of a sample of laser-cooled atoms trapped in an optical lattice. One of the optical lattice beams serves also as a probe beam, thereby allowing one to monitor the atomic dynamics in real time and with minimal perturbation. A simple theory is developed to predict the measurement sensitivity and associated cost in terms of decoherence caused by the scattering of probe photons. Calculated signal-to-noise ratios in measurements of Larmor precession are found to agree with experimental data for a wide range of lattice intensity and detuning. Finally, quantum back-action is estimated by comparing the measurement sensitivity to spin projection noise, and shown to be insignificant in the current experiment. A continuous quantum measurement based on Faraday spectroscopy in optical lattices may open up new possibilities for the study of quantum feedback and classically chaotic quantum systems.
AbstractList The linear Faraday effect is used to implement a continuous measurement of the spin of a sample of laser-cooled atoms trapped in an optical lattice. One of the optical lattice beams serves also as a probe beam, thereby allowing one to monitor the atomic dynamics in real time and with minimal perturbation. A simple theory is developed to predict the measurement sensitivity and associated cost in terms of decoherence caused by the scattering of probe photons. Calculated signal-to-noise ratios in measurements of Larmor precession are found to agree with experimental data for a wide range of lattice intensity and detuning. Finally, quantum back-action is estimated by comparing the measurement sensitivity to spin projection noise, and shown to be insignificant in the current experiment. A continuous quantum measurement based on Faraday spectroscopy in optical lattices may open up new possibilities for the study of quantum feedback and classically chaotic quantum systems.
Author Smith, Greg A
Chaudhury, Souma
Jessen, Poul S
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Issue 4
Keywords Optical lattices
Spin
Quantum measure
Faraday effect
Larmor precession
Magneto-optical effects
Signal-to-noise ratio
Laser cooling
Collective process
Experimental study
Atom trapping
Language English
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PublicationTitle Journal of optics. B, Quantum and semiclassical optics
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SubjectTerms Atomic and molecular physics
Atomic properties and interactions with photons
Exact sciences and technology
Optical cooling of atoms; trapping
Photon interactions with atoms
Physics
Title Faraday spectroscopy in an optical lattice: a continuous probe of atom dynamics
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