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Coherent matter waves in extended free fall

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Coherent matter waves in extended free fall

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  • Author: Christian Deppner, Holger Ahlers, Nicholas P. Bigelow, Naceur Gaaloul, Waldemar Herr, Carsten Klempt, Maike D. Lachmann, Jason R. Williams, Christian Schubert, Wolfgang Ertmer and Ernst M. Rasel
Q uantum sensors based on coherent matter-waves have numerous applications in fundamental physics measurements, gravimetry and gradiometry, as well as inertial sensing. The wave nature of ultracold atomic ensembles gets exploited to perform light-pulse atom interferometry, measuring small accelerations with high precision. Extending the free fall duration allows for boosting the performance of the sensor. However, repulsive inter-particle interactions affect the expansion of the atomic ensemble. Different techniques for lowering the ensembles expansion velocity have been developed and tested in various laboratory and free fall environments. They provide the basis for the development of future atomic sources, sensors and tests of fundamental physics with unprecedented sensitivities

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