Multimode Kapitza-Dirac Interferometry with Trapped Cold Atoms

Year: 2014

Authors: Li W.D., He, T.C., Smerzi A.

Autors Affiliation: Shanxi Univ, Inst Theoret Phys, Taiyuan 030006, Peoples R China; Shanxi Univ, Dept Phys, Taiyuan 030006, Peoples R China; INO CNR, QSTAR, I-50125 Florence, Italy; LENS, I-50125 Florence, Italy.

Abstract: We design a multimode interferometer with cold atoms confined in a harmonic trap. A first Kapitza-Dirac pulse creates several spatially addressable modes which are coherently recombined by the harmonic potential and mixed again by a second Kapitza-Dirac pulse. A phase shift among the mode is estimated by fitting the density profile or by measuring the number of atoms in each output mode. The expected sensitivity is rigorously calculated with the Fisher information and the Cramer-Rao lower bound. For the measurement of the gravitational acceleration g we predict, with typical parameters of a compact setup, a temperature independent sensitivity which can exceed, by several orders of magnitude, the sensitivity of current atomic interferometers.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 113 (2)      Pages from: 23003-1  to: 23003-5

More Information: We would like to thank D. Calonico, M. Fattori, M. Kasevich, and N. Poli for fruitful discussions. This work was supported by the NNSFC (Grants No. 11374197, No. 11074155, No. 10934004), PCSIRT (Grant No. IRT13076), National Programs for High Technology Research and Development of China (Grant No. 2011AA010801), and by the European Commission small or medium-scale focused research project QIBEC, Contract No. 284584). QSTAR is the MPQ, LENS, IIT, UniFi Joint Center for Quantum Science and Technology in Arcetri.
KeyWords: Diffraction; Gravity; Limit
DOI: 10.1103/PhysRevLett.113.023003

Citations: 28
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