Phys. Rev. Lett. 89, 200402 (2002) [4 pages]Direct Measurement of the Wigner Function of a One-Photon Fock State in a CavityReceived 11 April 2002; published 28 October 2002 We have measured the complete Wigner function W of the vacuum and of a single-photon state for a field stored in a high-Q cavity. This experiment implements the direct Lutterbach and Davidovich method [ L. G. Lutterbach and L. Davidovich Phys. Rev. Lett. 78 2547 (1997)] and is based on the dispersive interaction of a single circular Rydberg atom with the cavity field. The nonclassical nature of the single-photon field is exhibited by a region of negative W values. Extensions to other nonclassical cavity field states are discussed. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.200402
DOI:
10.1103/PhysRevLett.89.200402
PACS:
03.65.–w, 42.50.Ar, 42.50.Dv
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