Standard layout for doing experiments with correlated photons. Interferometer components are nonpolarizing beam splitters (BS) and metallic mirrors (m). Band-pass filters (f) precede couplers to multimode fibers, which send light to detectors , , and . The beam dump (d) collects the pump beam for safety.
Single-photon interference obtained with the setup in Fig. 1. Coincidence counts at detectors and (circles), and and (triangles) represent detections, where heralded photons leave the interferometer along the directions and , respectively.
Schematic of the (a) apparatus and (b) data for the quantum eraser. The data show cases when the light leaves the interferometer along the direction not carrying path information (triangles) and when the light leaves along the direction carrying path information (circles).
Schematic of the (a) apparatus and (b) data for measuring outputs of single-photon interference. Coincidence at detectors and (circles; left scale) shows single-photon interference as a function of the interferometer phase. The solid line is a fit to the data with and , where , , , , and are the fitting parameters. The calculated values of the second-order coherence coefficient were obtained via the triple coincidences at detectors , , and (triangles; right scale).
Schematic of the (a) apparatus and (b) data for the experiment where both photons enter the interferometer collinearly. The data show cases where both photons are detected leaving the same port of the interferometer (circles; coincidences at detectors and ) and separate ports of the interferometer (triangles; coincidences in detectors and ).
Schematic of the (a) apparatus and (b) data for the experiment showing the correlations of photon pairs in maximally entangled states (circles) compared to mixed states (triangles).
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