singlequantum
Singlequantum is a term used in physics to denote the smallest indivisible unit of a physical quantity within a quantum system. In practice, the most common examples are a single photon as the quantum of the electromagnetic field, a single phonon as the quantum of vibrational energy in a solid, or a single excitation counted in a quantized field. The term is not universally standardized and often appears in informal usage or within compound terms such as "single-quantum state".
Conceptually, a single quantum refers to the occupancy n=1 of a quantized mode, described in physics by
Practical realization involves specialized sources and detectors with high efficiency and low noise. Examples include single-photon