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- W2314470746 abstract "We propose to generate a counter-Einstein-Podolsky-Rosen (CEPR) state which possesses a positively-correlated momentum and anticorrelated position directly from spontaneous parametric down-conversion. The general CEPR state is given under a tightly focused Gaussian pump based on type II noncritical phase matching. We analytically and numerically study how a positively-correlated momentum and anticorrelated position of a biphoton can be achieved by choosing the proper focal parameter of the pump. To verify the degree of entanglement of the CEPR state, we calculate its entanglement entropy and it shows a unique dependence on the pump's focal parameter. Suggestions for practical engineering of the state are also given. Furthermore, based on an ideal CEPR state, we deduce a type of erect quantum ghost imaging which can be applied as the entanglement criterion. This work gives applicable references to the spatial control of an entangled photon source in experiments and may stimulate the development of new types of quantum technologies." @default.
- W2314470746 created "2016-06-24" @default.
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- W2314470746 date "2012-08-29" @default.
- W2314470746 modified "2023-10-16" @default.
- W2314470746 title "Generation of positively-momentum-correlated biphotons from spontaneous parametric down-conversion" @default.
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- W2314470746 doi "https://doi.org/10.1103/physreva.86.023852" @default.
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