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(a) Sketch of the GL-SMF system lying within the confocal parameter of the input mode. (b) Picture of two GL-SMF systems put face to face. Each GRIN lens is glued to the input face of the corresponding single-mode optical fiber. (c) Comparison between the collection efficiency of a GL-SMF (black curve) and a objective as a function of transverse displacement. is the full width at half maximum of the Gaussian fitting curve.
Experimental setup used for polarization Bell-state measurements. The basic elements of the entanglement source are described in Ref. 21.
Coincidence rate measured as a function of the mirror M position for (black curve) and (red curve).
Tomographic reconstruction of the four polarization-entangled generated states (real parts). A maximum likelihood technique was used to obtain physical density matrices. The imaginary components are negligible. The corresponding theoretical Bell states are: (a) , (b) , (c) , and (d) .
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