Photon

- Modern Physics -
Quantum Mechanics Dictionary
Definition

A quantum optics concept defining quantized light fields and their interaction with matter in controlled settings. It governs emission, absorption, coherence properties, and readout statistics for optical and microwave systems. It does not ensure ideal behavior without well-characterized loss, coupling, and calibration parameters.

Photon

Natural & Formal Sciences Dictionary
Definition
A quantum of the electromagnetic field: a massless bosonic excitation that carries energy E = hν and momentum |p| = E/c, characterized by polarization degrees of freedom and quantum statistics appropriate to bosons.