Bell tests with entangled light have been performed many times in many ways using\nlinear polarizers, but the same tests have never been done with a circular polarizer.\nUntil recently there has never been a true circular polarization beam splitterââ?¬â?an\noptical component that separates light directly into left and right handed polarizations.\nUsing a true circular polarization beam splitter based on birefringent gratings,\nentangled light has been analyzed with unexpected results.
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