Feedback control of an interacting Bose-Einstein condensate using phase-contrast imaging

S. S. Szigeti; M. R. Hush; A. R.R. Carvalho; J. J. Hope

doi:10.1103/PhysRevA.82.043632

Feedback control of an interacting Bose-Einstein condensate using phase-contrast imaging

S. S. Szigeti, M. R. Hush, A. R.R. Carvalho, J. J. Hope

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

The linewidth of an atom laser is limited by density fluctuations in the Bose-Einstein condensate (BEC) from which the atom laser beam is outcoupled. In this paper we show that a stable spatial mode for an interacting BEC can be generated using a realistic control scheme that includes the effects of the measurement backaction. This model extends the feedback theory, based on a phase-contrast imaging setup, presented by Szigeti, Hush, Carvalho, and Hope [Phys. Rev. APLRAAN1050-294710.1103/PhysRevA.80.013614 80, 013614 (2009)]. In particular, it is applicable to a BEC with large interatomic interactions and solves the problem of inadequacy of the mean-field (coherent state) approximation by utilizing a fixed number state approximation. Our numerical analysis shows the control to be more effective for a condensate with a large nonlinearity.

Original language	English
Article number	043632
Journal	Physical Review A - Atomic, Molecular, and Optical Physics
Volume	82
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevA.82.043632
Publication status	Published - 29 Oct 2010

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Feedback control of an interacting Bose-Einstein condensate using phase-contrast imaging

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