R. Wiegner, C. Thiel, J. von Zanthier, G. S. Agarwal
Published 2011-02-08, updated 2011-09-13Version 3
We discuss the possibility of quantum interferences and entanglement of photons which exist at different intervals of time, i.e., one photon being recorded before the other has been created. The corresponding two-photon correlation function is shown to violate Bell's inequalities.
Comments: 3 pages, 2 figures
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