Physics – Quantum Physics
Scientific paper
2012-02-13
Physics
Quantum Physics
14 pages, 7 figures
Scientific paper
We study the generation of strongly-correlated photons by coupling an atom to photonic quantum fields in a one-dimensional waveguide. Specifically, we consider a three-level or four-level system for the atom. Photon-photon bound-states emerge as a manifestation of the strong photon-photon correlation mediated by the atom. Effective repulsive or attractive interaction between photons can be produced, causing either suppressed multiphoton transmision (photon blockade) or enhanced multiphoton transmision (photon-induced tunneling). As a result, nonclassical light sources can be generated on demand by sending coherent states into the proposed system. We calcuate the second-order correlation function of the transmitted field and observe bunching and anti-bunching caused by the bound-states. Furthermore, we demonstrate that the proposed system can produce photon pairs with a high degree of spectral entanglement, which have a large capacity for carrying information and are important for large-alphabet quantum communication.
Baranger Harold U.
Gauthier Daniel J.
Zheng Huaixiu
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