Ooi, Chong Heng Raymond and Lee, H.W. and Kim, B.G.
(2007)
*Coherent effects on two-photon correlation and directional emission of two two-level atoms.*
Physical Review A, 75 (6).
ISSN 1050-2947,
DOI https://doi.org/10.1103/PhysRevA.75.063801.

## 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 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 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 parallel to +/->(k0)=e(0)(ik)center dot r(1)parallel to a(1),b(2)>+/- e(0)(ik)center dot r(2)parallel to b(1),a(2)> by a laser pulse with wave vector k(0). Photon emission is directionally suppressed along k(0) for the phased-antisymmetric state. The directionality ceases for interatomic distances less than lambda/2.

Item Type: | Article |
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Funders: | UNSPECIFIED |

Additional Information: | Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA |

Uncontrolled Keywords: | Single-photon; Radiation; System; Interference |

Subjects: | Q Science > QC Physics |

Divisions: | Faculty of Science > Department of Physics |

Depositing User: | Miss Malisa Diana |

Date Deposited: | 08 Jul 2013 08:19 |

Last Modified: | 09 Oct 2019 00:49 |

URI: | http://eprints.um.edu.my/id/eprint/7938 |

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