Reply To: A Christmas Photonic Teaser

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Dr Andrew Smith

If the Xmas quiz is not challenging enough for you you might like to investigate the modern view of what a photon is.

They certainly don’t stream from a star to your eye and most states of the quantum em field don’t have a number operator (you can’t say how many photon it has) and to cap it all they don’t have a position operator (so can’t say where they are).

Try Googling “The concept of the Photon revisited ” for an interesting discussion. The text is quite accessible without the maths. The paper us by Muthukrishnan · 2003 ·

Regards Andrew