The correlation experiment for a HeNe laser light source.
A pump laser undergoes spontaneous parametric down conversion in a -barium borate (BBO) crystal. The down-converted light is filtered before hitting the couplers. Although most of the pump laser passes unaffected through the crystal, we omit this beam from the diagram for clarity.
The three-detector correlation experiment using a light source derived from spontaneous parametric down conversion.
Two steering mirrors guide one arm of the down-converted light into a Mach–Zehnder interferometer with movable mirror . By using detectors , , and , we continually monitor to verify single photons in the interferometer.
Conditioned count rate as a function of the (scaled) path length difference for single photons in a Mach–Zehnder interferometer. Interference is observed when photons are “untagged” (filled circles) but is not observed when photons are tagged (crosses). Interference returns when a polarizer erases the path information (open circles). The smooth curves are the predictions given by Eq. (21).
Three-detector anticorrelation parameter as a function of the twin production rate . The error bars denote the standard error.
Correlation results for the transmitted and reflected channels of a HeNe laser through a beam splitter (rates in cps). We report averages of 25 5 s runs. is calculated according to Eq. (1). The values in parentheses are the uncertainty in the rightmost digits as determined by the standard error.
Correlation results for the two arms of our down-converted light source at two different count rates (all rates measured in cps). We report averages of 25 5 s runs. The values of the anticorrelation parameter indicate that the two arms are correlated (standard errors in parentheses).
Correlation results for a three-detector measurement using a down-converted light source (all rates measured in cps). We report averages of 25 5 s runs. Although not shown, and are approximately the same as . The values in parentheses are the uncertainties in the rightmost digit as determined by the standard error.
Correlation results for the two arms of our down-converted light source with no bandpass filters in front of the detector couplers (all rates measured in cps). We report averages of 25 5 s runs. The values in parentheses are the uncertainty in the rightmost digit as determined by the standard error.
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