A duckduckgo search with single photon detector found much of interest including Invited Review Article: Single-photon sources and detectors. Have a look at C. Photon-number-resolving detectors which discusses several techniques.
Today students do experiments with single photons. For example I refer you to the Advanced Laboratory Physics Association's Single Photon Quantum Mechanics which says
If you can accept that an interferometer is equivalent to a double slit I think your objection is answered.
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Thank you for pointing that out although I credit the readers here with the ability to spot that without needing you to recap it for them. btw, it isn't a quote - it is my recap of a lecture I attended.
Each to his own but I read those accounts differently to you.
In order to explain the...
I think an interesting thing about the double slit experiment is to do it this way.
Experiment A: Get 100 different people located all over the world. Each person does their double slit experiment with just one photon or electron. All the experiments are done at different times so there is...
That suggests a way (well, half a way) of traveling into the future. What happens if we wait a hundred years before opening the box and we find the cat is alive?
How has it survived 100 years when a cat's typical life span is less than twenty years?
Or is it saying that, in the "found alive"...