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- W2590754292 abstract "We study the spatiotemporal structure of the biphoton entangled state generated by the four-wave mixing (FWM) process in a cold two-level atomic ensemble. We analyze, for the first time, the X-like shaped structure of the biphoton entangled state and the geometry of the biphoton correlation for different lengths and densities of the cold atomic ensemble. The propagation equations of the photon pairs generated from FWM process are derived in a spatiotemporal framework. By means of the input-output relations of the propagation equations, the biphoton amplitude function is obtained in a spatiotemporal domain. In the given frequency range, the biphoton amplitude displays an X-like shaped geometry, nonfactorizable in the space-time domain. Such an X-like shaped spatiotemporal structure is caused by the phase matching and the FWM gain. The former leads to the X-like shaped envelope of the biphoton correlation, while the latter gives rise to the oscillations around the X-like shaped envelope." @default.
- W2590754292 created "2017-03-03" @default.
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- W2590754292 date "2017-02-20" @default.
- W2590754292 modified "2023-09-24" @default.
- W2590754292 title "The X-like shaped spatiotemporal structure of the biphoton entangled state in a cold two-level atomic ensemble" @default.
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- W2590754292 doi "https://doi.org/10.1038/srep42373" @default.
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