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Phys Rev Lett. 2013 Aug 23;111(8):083001. Epub 2013 Aug 19.

Multiaxis inertial sensing with long-time point source atom interferometry.

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Department of Physics, Stanford University, Stanford, California 94305, USA.


We show that light-pulse atom interferometry with atomic point sources and spatially resolved detection enables multiaxis (two rotation, one acceleration) precision inertial sensing at long interrogation times. Using this method, we demonstrate a light-pulse atom interferometer for 87Rb with 1.4 cm peak wave packet separation and a duration of 2T=2.3 s. The inferred acceleration sensitivity of each shot is 6.7×10(-12)g, which improves on previous limits by more than 2 orders of magnitude. We also measure Earth's rotation rate with a precision of 200 nrad/s.

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