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Fiber-optic two-photon interferometer. FC: fiber coupler, PC1-3: polarization controller, W1-2: PPLN waveguide, LPF1-2: long-pass filter, PMF: polarization maintaining fiber, PBS: polarizing beam splitter, SMF: single-mode fiber, BPF1-2: bandpass filter, L1-2: linear polarizer, QWP: quarter-wave plate, D1-2: single-photon detector, PC: personal computer.
Observed temporal changes in , and . These parameters are calculated from , , and . During coincidence measurements, , , , and are monitored in sequence, and these measurements are repeated in the same order. Accidental coincidences are excluded.
Coincidences (closed circles) and (open circles). We alternately monitored and . Accidental coincidences are included.
Operating conditions of single-photon detectors.
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