Optically trapped atom interferometry using the clock transition of large 87Rb Bose-Einstein condensates

G McDonald, P. A. Altin, D. Döring, J E Debs, T H Barter, J D Close, N P Robins, S A Haine, T M Hanna, R. P. Anderson

Research output: Contribution to conferencePoster


We present a Ramsey-type atom interferometer operating with an optically trapped sample of 106 Bose-condensed 87Rb atoms. We investigate this interferometer experimentally and theoretically with an eye to the construction of future high precision atomic sensors. Our results indicate that, with further experimental refinements, it will be possible to produce and measure the output of a sub-shot-noise limited, large atom number BEC-based interferometer. The optical trap (shown in Figure 1 (c)) allows us to couple the |F = 1,mF = 0) → |F = 2,mF = 0) clock states using a single photon 6.8 GHz microwave transition, while state selective readout is achieved with absorption imaging. We analyse the process of absorption imaging and show that it is possible to observe atom number variance directly, with a signal-to-noise ratio ten times better than the atomic projection noise limit on 106 condensate atoms. We discuss the technical and fundamental noise sources that limit our current system, and present theoretical and experimental results on interferometer contrast, de-phasing and miscibility.

Original languageEnglish
Number of pages3
Publication statusPublished - 2011
EventInternational Quantum Electronics Conference and Conference on Lasers and Electro-Optics Pacific Rim 2011 - Sydney Convention and Exhibition Centre, Sydney, Australia
Duration: 28 Aug 20111 Sep 2011
https://www.osapublishing.org/conference.cfm?meetingid=89&yr=2011 (Proceedings)


ConferenceInternational Quantum Electronics Conference and Conference on Lasers and Electro-Optics Pacific Rim 2011
Abbreviated titleIQEC/CLEO-PR 2011
OtherJoint-held conference
Internet address

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