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Compared to light interferometers, the flux in cold-atom interferometers is low and the associated shot noise large. Sensitivities beyond these limitations require the preparation of entangled atoms in different momentum modes. Here, we demonstrate a source of entangled atoms that is compatible with state-of-the-art interferometers. Entanglement is transferred from the spin degree of freedom of a Bose-Einstein condensate to well-separated momentum modes, witnessed by a squeezing parameter of -3.1(8) dB. Entanglement-enhanced atom interferometers open up unprecedented sensitivities for quantum gradiometers or gravitational wave detectors.
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Fabian Anders, Alexander Idel, Bernd Meyer, Carsten Klempt, "Momentum entanglement for atom interferometry," Proc. SPIE 11700, Optical and Quantum Sensing and Precision Metrology, 117000C (5 March 2021); https://doi.org/10.1117/12.2588445