The Photon
In Our Time: Science
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The Nature of the Photon
In Cartwright what are the other areas in which understanding photon theory could lead to technological breakthroughs? Well one example that uses some of the classical ideas of photons and combines them with quantum is the idea of what's called quantum entanglement. This actually enables you to use those photons to produce a cryptography that is in principle unbreakable because the people on either end can tell if you are trying to listen into their transmission. Can I just finish with the question which started the program Einstein said that he didn't really grasp the nature of the photon and as he said at the time it's all changed now Einstein doesn't think anybody else has it all changed do you?
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