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- Summary
- Coherent states would be classic states according to the definition of "quantumness" !

Hi,

In this presentation slide 17 it is mentionned :

Is there any confusion with the fact that coherent states are said to be semi-classical ?

In this presentation slide 17 it is mentionned :

Is there any confusion with the fact that coherent states are said to be semi-classical ?

/Patrickhttp://lptms.u-psud.fr/ressources/publis/2010/Quantifying quantumness and the quest for Queens of Quantum.pdf

In physics there is a wide consensus that the “least quantum” (or “most classical”) pure states are coherent states. These are states which present the smallest possible amount of quantum fluctuations, as defined by a suitable Heisenberg uncertainty relation, evenly distributed over a pair of non-commuting variables.For example, in quantum optics, coherent states have that property of minimal and equal uncertainty for the field quadratures. Moreover, the dynamics of the latter is identical to that given by the classical equations of motion of the harmonic oscillator, and the property of minimal uncertainty is conserved during the time evolution created by the Hamiltonian of the electromagnetic field. The most classical mixed states possible can be obtained as a statistical mixture of coherent states.