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Retraction

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Science  25 Jul 2008:
Vol. 321, Issue 5888, pp. 489a
DOI: 10.1126/science.321.5888.489a

Extensive efforts with revamped apparatus to reproduce the results published in our 2004 Science Report, “Real-time quantum feedback control of atomic spin-squeezing” (1), have failed, as have attempts to develop a quantitative understanding of how those results could have arisen spuriously. We must therefore retract the Report.

J. M. Geremia accepts primary responsibility for his large role in acquiring and analyzing the data upon which this paper was based. J. K. Stockton and H. Mabuchi also accept responsibility for failing initially to probe these results with sufficient skepticism. In the course of our efforts to understand the results subsequent to their publication, we have come to appreciate that analyzing Faraday spectroscopy of alkali clouds at high optical depth in precise quantitative detail is surprisingly challenging. Our understanding of this system as of 2006 is described in J. K. Stockton's thesis (2), together with a preliminary reassessment of published results; continuing research in the group of H. Mabuchi has improved upon the thesis results. We now have a technical understanding sufficient to rule out any possibility of spin-squeezing under the conditions of our 2004 experiment.

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