= Hanbury Brown and Twiss effect
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<Robert Hanbury Brown> and <Richard Q. Twiss> sought <angular sizes> through correlations of detected <light intensities>. Their method multiplies detector outputs after detection, whereas a <Michelson interferometer> combines fields before detection.<Correlation between Photons in two Coherent Beams of Light by Robert Hanbury Brown and Richard Quentin Twiss>[1956, Nature 177, pp. 27–29, accessible opening paragraphs]{ref}
A monochromatic discharge source illuminated a half-silvered <beam splitter> and two <photodetectors>. The averaged current product showed an excess near coincidence. Moving one detector introduced a delay that removed it, supplying a control. Slow response weakened the peak. This <photon bunching> is compatible with fluctuating classical <light intensity>.<One Hundred Years of Light Quanta by Roy Jay Glauber>[2005 individual Nobel lecture, pp. 86–88, figures 3–4]{ref}
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