Narrowband Biphoton Generation due to Long-Lived Coherent Population Oscillations

Details Narrowband Biphoton Generation due to Long-Lived Coherent Population Oscillations Narrowband Biphoton Generation due to Long-Lived Coherent Population Oscillations

2010-07-06

arxiv.org/abs/1007.0869v2

Physics

Quantum Physics

7 pages, 2 figures

Scientific paper

We study the generation of paired photons due to the effect of four-wave mixing in an ensemble of pumped two-level systems that decay via an intermediate metastable state. The slow population relaxation of the metastable state to the ground state is utilized to create long-lived coherent population oscillation, leading to narrowband nonlinear response of the medium. The biphotons have a narrow bandwidth, long coherence time and length, which can be controlled by the pump field. In addition, the biphotons are antibunched, with antibunching period determined by the dephasing time. During this period, damped oscillations of the biphoton wavefunction occurs if the pump detuning is non-zero.

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