- #1
thephystudent
- 123
- 37
Before quantum mechanics, light was generally seen as a wave and matter as particles (biliards). From e.g. the discovery of the photoelectric effect, one saw that light can also be seen as a particle. From e.g. the double slit experiment, one makes the interpretation that matter can also be seen as a wave.
One of the early conclusions of quantum mechanics is then that waves and particles are the same thing. Nevertheless, we would refer to the 'classical limit' of light to be a wave (i.e. a coherent state) and the 'classical limit' of matter to be particles (i.e. a fock state). Where does this distinction actually show up?
I would think that having a finite mass or not has at least something to do with it, but I'm not sure where the distinction enters precisely.
A standard explanation from introductionary quantum mechanics is that the de broglie wavelength scales inversely to mass. But to me this seems quite ad hoc given our current knowledge of quantum mechanics.
The transitions from quantum mechanics to the classical world occur trough decoherence. So why does decoherence act differently on light than on say electrons? It means that both have different pointer states?
One of the early conclusions of quantum mechanics is then that waves and particles are the same thing. Nevertheless, we would refer to the 'classical limit' of light to be a wave (i.e. a coherent state) and the 'classical limit' of matter to be particles (i.e. a fock state). Where does this distinction actually show up?
I would think that having a finite mass or not has at least something to do with it, but I'm not sure where the distinction enters precisely.
A standard explanation from introductionary quantum mechanics is that the de broglie wavelength scales inversely to mass. But to me this seems quite ad hoc given our current knowledge of quantum mechanics.
The transitions from quantum mechanics to the classical world occur trough decoherence. So why does decoherence act differently on light than on say electrons? It means that both have different pointer states?