Coherence Properties of Nanofiber-Trapped Cesium Atoms

Author(s): D. Reitz, C. Sayrin, R. Mitsch, A. Rauschenbeutel

Journal: Physical Review Letters

Volume: 110

Page(s): 243603

Year: 2013

DOI Number: 10.1103/PhysRevLett.110.243603

Link: Link to publication


We experimentally study the ground state coherence properties of cesium atoms in a nanofiber-based two-color dipole trap, localized ∼200 nm away from the fiber surface. Using microwave radiation to coherently drive the clock transition, we record Ramsey fringes as well as spin echo signals and infer a reversible dephasing time of T2*=0.6 ms and an irreversible dephasing time of T2′=3.7 ms. By modeling the signals, we find that, for our experimental parameters, T2* and T2′ are limited by the finite initial temperature of the atomic ensemble and the heating rate, respectively. Our results represent a fundamental step towards establishing nanofiber-based traps for cold atoms as a building block in an optical fiber quantum network.


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