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 in | Journal of optics. B, Quantum and semiclassical optics Vol. 5; no. 4; pp. 323 - 329 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Bristol
IOP Publishing
01.08.2003
Institute of Physics |
Subjects | |
Online Access | Get full text |
ISSN | 1464-4266 1741-3575 |
DOI | 10.1088/1464-4266/5/4/301 |
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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. |
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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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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 |
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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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