All photons are equal but some photons are more equal than others

Details All photons are equal but some photons are more equal than others All photons are equal but some photons are more equal than others

2011-08-25

arxiv.org/abs/1108.5036v1

Physics

Quantum Physics

5 pages, 1 figure, submitted to PRL

Scientific paper

Photons indistinguishability is studied from a pragmatic, rather than speculative, point of view. As consequence of a detailed analysis of the coincidence probability distribution in a Hong-Ou- Mandel experiment, we introduce the concept of rate of distinguishability of photons. For photons prepared in a given, but arbitrary, state, this parameter allows one to make a quantitative analysis of their indistinguishability. Among other things, our study reveals that coupling between different degrees of freedom of the electromagnetic field, plays a crucial role in photons indistinguishability.

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