XPost: sci.electronics.design   
   From: jeroen@nospam.please   
      
   On 2/14/26 16:54, john larkin wrote:   
   > On Sat, 14 Feb 2026 10:47:10 +0100, Jeroen Belleman   
   >  wrote:   
   >   
   >> On 2/14/26 00:35, Stefan Ram wrote:   
   >>> john larkin  wrote or quoted:   
   >>>> Single photons sure behave like particles, especially the energetic   
   >>>> ones.   
   >>>   
   >>>     Wave-like interference can be observed in the famous double-slit   
   >>>     experiment. Now, what happens when we reduce the intensity of the   
   >>>     incoming light to one single photon? We get one single spot on the   
   >>>     detector screen! So, does this mean "no wave behavior"? Well, when   
   >>>     we repeat this with many single photons, one after the other, in   
   >>>     the end, we get the same interference pattern on that screen created   
   >>>     by all those dots!   
   >>   
   >> This is misleading. There is no single-photon gun.   
   >   
   > I recall someone making a laser sort of thing that dispenses a single   
   > photon periodically.   
      
   Yeah, sort of. The usual thing is a laser shining on a BBO crystal.   
   This produces light of lower frequency. They say 'they split the   
   photon into idler and signal photons'. They then say they detect   
   one and infer the existence of the other. 'Heralded photons'.   
      
   It's true there will be some degree of correlation, but this is   
   not the same as firing individual photons. You can fire individual   
   fermions, but photons? No.   
      
   There's a lot of QM nonsense going around. The QM crowd also thought   
   that Hanbury-Brown and Twiss couldn't be right. In the end, they were.   
      
   Jeroen Belleman   
      
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