Nonclassical light


Nonclassical light is light that cannot be described using classical electromagnetism; its characteristics are described by the quantized electromagnetic field and quantum mechanics.
Most common described forms of nonclassical light are the following:
The density matrix for any state of light can be written as:
where is a coherent state. A classical state of light is one in which is a probability density function. If it is not, the state is said to be nonclassical.
Aspects of that would make it nonclassical are:
The matter is not quite simple. According to Mandel and Wolf: "The different coherent states are not orthogonal, so that even if behaved like a true probability density , it would not describe probabilities of mutually exclusive states."

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