, Volume 10, Issue 3, pp 227–238

New light on the optical equivalence theorem and a new type of discrete diagonal coherent state representation

  • N Mukunda
  • E C G Sudarshan

DOI: 10.1007/BF02872020

Cite this article as:
Mukunda, N. & Sudarshan, E.C.G. Pramana - J. Phys. (1978) 10: 227. doi:10.1007/BF02872020


In many instances we find it advantageous to display a quantum optical density matrix as a generalized statistical ensemble of coherent wave fields. The weight functions involved in these constructions turn out to belong to a family of distributions, not always smooth functions. In this paper we investigate this question anew and show how it is related to the problem of expanding an arbitrary state in terms of an overcomplete subfamily of the overcomplete set of coherent states. This provides a relatively transparent derivation of the optical equivalence theorem. An interesting by-product is the discovery of a new class of discrete diagonal representations.


Optical equivalence theorem coherent states overcomplete family of states discrete diagonal representation 

Copyright information

© the Indian Academy of Sciences 1977

Authors and Affiliations

  • N Mukunda
    • 1
  • E C G Sudarshan
    • 1
  1. 1.Centre for Theoretical StudiesIndian Institute of ScienceBangalore
  2. 2.Department of PhysicsUniversity of TexasAustinUSA

Personalised recommendations