Figure 1.
(a) Schematic of the experimental setup. The signal (blue) goes to the homodyne detector, whereas the idler (orange) passes through C1 (55 MHz) and C2 (7 MHz) before detection via the SPCM. The EOM between C1 and C2 is optional. (b) The 85Rb three-level Λ system, with the fields' configuration shown. (c) Reconstruction of the state of the electromagnetic field in the temporal mode determined experimentally (unmodulated case). Left to right: experimental quadrature distribution (blue) overlaid with that for the vacuum state (red); diagonal elements of the Fock-basis density matrix; Wigner function. The single-photon fraction is 52.9%. C1, C2: filter cavities; EOM: electro-optic modulator; SPCM: single photon counting module.
