Abstract
two intermediate collective states, b oscillations in the two-photon correlation G 2 , c emission of two photons by one atom, and d the loss of directional correlation. We compare the population dynamics during the two-photon emission process with the dynamics of single-photon emission in the cases of a and a V scheme. We compute the temporal correlation and angular correlation of two successively emitted photons using the G 2 for different values of atomic separation. We find antibunching when the atomic separation is a quarter wavelength /4. Oscillations in the temporal correlation provide a useful feature for measuring subwavelength atomic separation. Strong directional correlation between two emitted photons is found for atomic separation larger than a wavelength. We also compare the directionality of a photon spontaneously emitted by the two atoms prepared in phased-symmetric and phased-antisymmetric entangled states ±k0 =e ik0·r1a1,b2±e ik0·r2b1,a2 by a laser pulse with wave vector k0. Photon emission is directionally suppressed along k0 for the phased-antisymmetric state. The directionality ceases for interatomic distances less than/2.
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