It’s quantum entanglement, but not as we know it say Kayn Forbes and David Andrews as we discover there is still plenty of room for quantum mechanics to evolve

Every form of light is comprised of individual packets of energy, known as photons. Their existence first became apparent in physics when Einstein observed that the photoelectric effect could only make sense if the electromagnetic field associated with light was quantized in such a way.

That is to say, the electromagnetic field had to consist of small quanta of energy – each with a discrete magnitude determined by wavelength – not a continuously variable energy, as had been assumed in previous ‘classical’ physics. This quantization, a switching from any magnitude for physical observables (energy, momentum, velocity, etc.) to discrete values, is fundamental in the theory of quantum mechanics.

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