G. Edward Marti, Ryan Olf, Dan M. Stamper-Kurn
Compact inertial sensing schemes using trapped- and guided-atom interferometers have been unable to achieve high precision because of uncontrolled phase errors caused by trapping potentials and interactions. Here, we demonstrate an atom-shot-noise limited acoustic interferometer that uses sound waves in a toroidal Bose-Einstein condensate to measure rotations. Our system operates at $10^4 - 10^6$ times higher density and in a volume $10^9$ times smaller than free-falling atom interferometers.
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http://arxiv.org/abs/1210.0033
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