Experimental position-time entanglement with degenerate single photons

Details Experimental position-time entanglement with degenerate single photons Experimental position-time entanglement with degenerate single photons

2007-09-06

arxiv.org/abs/0709.0847v2

Phys. Rev. A 77, 023803 (2008)

Physics

Quantum Physics

Updated to published version, new fig. 4., corrected typos

Scientific paper

10.1103/PhysRevA.77.023803

We report an experiment in which two-photon interference occurs between degenerate single photons that never meet. The two photons travel in opposite directions through our fibre-optic interferometer and interference occurs when the photons reach two different, spatially separated, 2-by-2 couplers at the same time. We show that this experiment is analogous to the conventional Franson-type entanglement experiment where the photons are entangled in position and time. We measure wavefunction overlaps for the two photons as high as 94 $\pm$ 3%.

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