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Cthugha
Science Advisor
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marksesl said:But, there is no mention of this being done in the delayed choice quantum experiments.
Of course not. At least not in the majority of experiments as they involve double slits. Temporal coherence does not matter for a double slit. A double slit measures spatial coherence. The quantity of interest in this case is momentum. The filtering in momentum space is mentioned. Just have a look at the size of the detectors given in the manuscripts.
edit: As it turns out, I was wrong about this. They do indeed also use a spectral filter, too. From the Walborn paper (PHYSICAL REVIEW A, VOLUME 65, 033818 (2002)):
"The detectors are EG&G SPCM 200 photodetectors, equipped with interference filters (bandwidth
1 nm) and 300 microm X 5 mm rectangular collection slits. A stepping motor is used to scan detector Ds ."
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