Phys. Rev. Lett. 103, 153601 (2009) [4 pages]Phase Shift of a Weak Coherent Beam Induced by a Single AtomReceived 22 May 2009; published 7 October 2009 We report on a direct measurement of a phase shift on a weak coherent beam by a single 87Rb atom in a Mach-Zehnder interferometer. By strongly focusing the probe mode to the location of the atom, a maximum phase shift of about 1° is observed experimentally. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.153601
DOI:
10.1103/PhysRevLett.103.153601
PACS:
42.50.Ct, 32.90.+a, 37.10.Gh
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