## Three-path atom interferometry with large momentum separation

26 Sep 2018  ·  Plotkin-Swing Benjamin, Gochnauer Daniel, McAlpine Katherine E., Cooper Eric S., Jamison Alan O., Gupta Subhadeep ·

We demonstrate the scale up of a symmetric three-path contrast interferometer to large momentum separation. The observed phase stability at separation of 112 photon recoil momenta ($112\hbar k$) exceeds the performance of earlier free-space interferometers... In addition to the symmetric interferometer geometry and Bose-Einstein condensate source, the robust scalability of our approach relies crucially on the suppression of undesired diffraction phases through a careful choice of atom optics parameters. The interferometer phase evolution is quadratic with number of recoils, reaching a rate as high as $7\times10^7$ radians/s. We discuss the applicability of our method towards a new measurement of the fine-structure constant and a test of QED. read more

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Atomic Physics Quantum Gases