, Volume 51, Issue 5, pp 633–642 | Cite as

Quantum correlations in optics

  • R. Ghosh
Quantum Optics


In many nonlinear optical problems, for example in down-conversion and four-wave mixing, the photons are generated in pairs. The strong correlation between the photons in a pair, characterized by either the correlations between operators corresponding to observables associated with individual photons, or the correlated state describing the two photons, may lead to various nonclassicalities. We discuss some of these nonclassical effects and their experimental demonstrations in nonlinear optical processes


Quantum correlations squeezing nonlinear mixing Wigner distribution 


42.50 03.65 42.65 


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Copyright information

© Indian Academy of Sciences 1998

Authors and Affiliations

  1. 1.School of Physical SciencesJawaharlal Nehru UniversityNew DelhiIndia

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