dorsal/arxiv
View SchemaTensor polarizability and dispersive quantum measurement of multilevel atoms
| Authors | JM Geremia, John K. Stockton, Hideo Mabuchi |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0501033 |
| URL | https://arxiv.org/abs/quant-ph/0501033 |
| DOI | 10.1103/PhysRevA.73.042112 |
Abstract
Optimally extracting information from measurements performed on a physical system requires an accurate model of the measurement interaction. Continuously probing the collective spin of an Alkali atom cloud via its interaction with an off-resonant optical probe is an important example of such a measurement where realistic modeling at the quantum level is possible using standard techniques from atomic physics. Typically, however, tutorial descriptions of this technique have neglected the multilevel structure of realistic atoms for the sake of simplification. In this paper we account for the full multilevel structure of Alkali atoms and derive the irreducible form of the polarizability Hamiltonian describing a typical dispersive quantum measurement. For a specific set of parameters, we then show that semiclassical predictions of the theory are consistent with our experimental observations of polarization scattering by a polarized cloud of laser-cooled Cesium atoms. We also derive the signal-to-noise ratio under a single measurement trial and use this to predict the rate of spin-squeezing with multilevel Alkali atoms for arbitrary detuning of the probe beam.
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"abstract": "Optimally extracting information from measurements performed on a physical\nsystem requires an accurate model of the measurement interaction. Continuously\nprobing the collective spin of an Alkali atom cloud via its interaction with an\noff-resonant optical probe is an important example of such a measurement where\nrealistic modeling at the quantum level is possible using standard techniques\nfrom atomic physics. Typically, however, tutorial descriptions of this\ntechnique have neglected the multilevel structure of realistic atoms for the\nsake of simplification. In this paper we account for the full multilevel\nstructure of Alkali atoms and derive the irreducible form of the polarizability\nHamiltonian describing a typical dispersive quantum measurement. For a specific\nset of parameters, we then show that semiclassical predictions of the theory\nare consistent with our experimental observations of polarization scattering by\na polarized cloud of laser-cooled Cesium atoms. We also derive the\nsignal-to-noise ratio under a single measurement trial and use this to predict\nthe rate of spin-squeezing with multilevel Alkali atoms for arbitrary detuning\nof the probe beam.",
"arxiv_id": "quant-ph/0501033",
"authors": [
"JM Geremia",
"John K. Stockton",
"Hideo Mabuchi"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.73.042112",
"title": "Tensor polarizability and dispersive quantum measurement of multilevel atoms",
"url": "https://arxiv.org/abs/quant-ph/0501033"
},
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