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- W2078178455 abstract "Sub- and superradiant dynamics of spontaneously decaying atoms are manifestations of collective many-body systems. We study the internal dynamics and the radiation properties of two atoms in free space. Interesting results are obtained when the atoms are separated by less than half a wavelength of the atomic transition, where the dipole-dipole interaction gives rise to new coherent effects, such as (a) coherence between 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 $ensuremath{Lambda}$ 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 $ensuremath{lambda}∕4$. 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 ${ensuremath{mid}ifmmodepmelsetextpmfi{}⟩}_{{mathbf{k}}_{0}}={e}^{i{mathbf{k}}_{0}∙{mathbf{r}}_{1}}ensuremath{mid}{a}_{1},{b}_{2}⟩ifmmodepmelsetextpmfi{}{e}^{i{mathbf{k}}_{0}∙{mathbf{r}}_{2}}ensuremath{mid}{b}_{1},{a}_{2}⟩$ by a laser pulse with wave vector ${mathbf{k}}_{0}$. Photon emission is directionally suppressed along ${mathbf{k}}_{0}$ for the phased-antisymmetric state. The directionality ceases for interatomic distances less than $ensuremath{lambda}∕2$." @default.
- W2078178455 created "2016-06-24" @default.
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- W2078178455 date "2007-06-01" @default.
- W2078178455 modified "2023-09-27" @default.
- W2078178455 title "Coherent effects on two-photon correlation and directional emission of two two-level atoms" @default.
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- W2078178455 doi "https://doi.org/10.1103/physreva.75.063801" @default.
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