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Point Source Atom Interferometry for Inertial Navigation and Precision Measurements

Yun-Jhih Chen, Elizabeth A. Donley, Azure Hansen, John E. Kitching

Published Jul 1, 2018• 0 citations
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Christopher Jekeli

Recent technological advancements in atom interferometry have demonstrated extremely precise inertial measurements of acceleration and rotation. These could be used to develop ultra-precise inertial navigation systems that approach GPS navigation. The paper presents a rudimentary exposition of the interferometer which is based on beams of atoms cooled by lasers to a velocity of the order of 1 m/s and launched along two trajectories that re-combine, as in a classical interferometer. Using the dual wave-particle quantum mechanical properties of atoms, the differential phase of the interfering beams is indicative of inertial acceleration and rotation, similar to the Sagnac effect. Due to the much shorter wavelength of the atomic beam, the sensitivity is many orders of magnitude greater. Concluding analyses show that an inertial navigation system with 5/hr drift is technically possible.

•Jun 9, 2004•3 citations
The use of matter-wave interferometry to detect inertial forces is already a powerful tool in precision measurement, but extending it beyond the lab to navigation applications requires optimization for compact setups. Here researchers characterize point-source atom interferometry (PSI) in a centimeter-scale cell, using an expanding cloud of cold atoms and an optical Raman interaction for simultaneous measurement of the system's acceleration along the Raman laser beams plus its rotation vector projected into the plane perpendicular to the beams. The sensitivity measurements presented here inform the further development of quantum inertial sensing that balances size and performance.
Recent technological advancements in atom interferometry have demonstrated extremely precise inertial measurements of acceleration and rotation. These could be used to develop ultra-precise inertial navigation systems that approach GPS navigation. The paper presents a rudimentary exposition of the interferometer which is based on beams of atoms cooled by lasers to a velocity of the order of 1 m/s and launched along two trajectories that re-combine, as in a classical interferometer. Using the dual wave-particle quantum mechanical properties of atoms, the differential phase of the interfering beams is indicative of inertial acceleration and rotation, similar to the Sagnac effect. Due to the much shorter wavelength of the atomic beam, the sensitivity is many orders of magnitude greater. Concluding analyses show that an inertial navigation system with 5/hr drift is technically possible.