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Ground state of the double-well condensate for quantum metrology

We discuss theoretically the ground state of a Bose-Einstein condensate with attractive atom-atom interactions in a double-well trap as a starting point of Heisenberg-limited atom interferometry. The dimensionless parameter governing the quality of the ground state for this purpose is identified. The near-degeneracy between the ground state and the first excited state severely curtails the prospects of the thermally prepared ground state in quantum metrology.

preprint2013arXivOpen access
Juha JavanainenHan Chen
physics.atom-phcond-mat.quant-gasquant-ph
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Juha JavanainenHan Chen

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