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We describe the creation and characterization of entangled or hyper-entangled quantum states using a fiber-based two-photon source. We use these entangled states to study local- and non-local realism.
Using photon pairs created via four-wave mixing in a microstructure fiber, we measure g(2)(0) of idler photons heralded by a signal photon to be well below one, and six times less than unconditional g(2)(0).
We test local realistic and non-local realistic theories using a fiber-based source of polarization-entangled photons. Our measurements violate local (certain non-local) hidden-variable theories by 15 (Leggett, A.) standard deviations.
Coupling two frequency-conjugate laser pulses into an optical fiber, we observe at the middle frequency either enhanced photon generation via four-wave mixing or suppressed Raman emission depending on the phase difference between the two pumps.
We observe significant classical and quantum correlation in photon-number noise measurements in four-wave mixing in micro-structured fiber. The classical correlation is the same as the quantum correlation obtained using photon counting
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