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A hands-on introduction to single photons and quantum mechanics for undergraduates
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10.1119/1.3354986
/content/aapt/journal/ajp/78/5/10.1119/1.3354986
http://aip.metastore.ingenta.com/content/aapt/journal/ajp/78/5/10.1119/1.3354986

Figures

Image of Fig. 1.
Fig. 1.

The correlation experiment for a HeNe laser light source.

Image of Fig. 2.
Fig. 2.

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.

Image of Fig. 3.
Fig. 3.

The three-detector correlation experiment using a light source derived from spontaneous parametric down conversion.

Image of Fig. 4.
Fig. 4.

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.

Image of Fig. 5.
Fig. 5.

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).

Image of Fig. 6.
Fig. 6.

Three-detector anticorrelation parameter as a function of the twin production rate . The error bars denote the standard error.

Tables

Generic image for table
Table I.

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.

Generic image for table
Table II.

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).

Generic image for table
Table III.

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.

Generic image for table
Table IV.

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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/content/aapt/journal/ajp/78/5/10.1119/1.3354986
2010-04-14
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A hands-on introduction to single photons and quantum mechanics for undergraduates
http://aip.metastore.ingenta.com/content/aapt/journal/ajp/78/5/10.1119/1.3354986
10.1119/1.3354986
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