Back-action evading measurement of the collective mode of a Bose–Einstein condensate

In this paper, we investigate theoretically the back-action evading measurement of the collective mode of an interacting atomic Bose–Einstein condensate (BEC) trapped in an optical cavity that is driven coherently by a pump laser with a modulated amplitude. It is shown that, for a specified kind of...

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Published in:Journal of the Optical Society of America. B, Optical physics Optical physics, 2020-05, Vol.37 (5), p.1263
Main Authors: Fani, Marjan, Dalafi, Ali
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Language:English
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description In this paper, we investigate theoretically the back-action evading measurement of the collective mode of an interacting atomic Bose–Einstein condensate (BEC) trapped in an optical cavity that is driven coherently by a pump laser with a modulated amplitude. It is shown that, for a specified kind of amplitude modulation of the driving laser, one can measure a generalized quadrature of the collective mode of the BEC indirectly through the output cavity field with a negligible back-action noise in the good-cavity limit. Nevertheless, the on-resonance added noise of measurement is suppressed below the standard quantum limit (SQL), even in the bad cavity limit. Moreover, the measurement precision can be controlled through the s -wave scattering frequency of atomic collisions.
doi_str_mv 10.1364/JOSAB.386227
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title Back-action evading measurement of the collective mode of a Bose–Einstein condensate
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