Arvind, * and Mukunda, N and Simon, R (1995) Characterisations of Classical and Nonclassical states of Quantised Radiation. [Preprint]

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Abstract
A new operator based condition for distinguishing classical from nonclassical states of quantised radiation is developed. It exploits the fact that the normal ordering rule of correspondence to go from classical to quantum dynamical variables does not in general maintain positivity. It is shown that the approach naturally leads to distinguishing several layers of increasing nonclassicality, with more layers as the number of modes increases. A generalisation of the notion of subpoissonian statistics for twomode radiation fields is achieved by analysing completely all correlations and fluctuations in quadratic combinations of mode annihilation and creation operators conserving the total photon number. This generalisation is nontrivial and intrinsically twomode as it goes beyond all possible single mode projections of the twomode field. The nonclassicality of pair coherent states, squeezed vacuum and squeezed thermal states is analysed and contrasted with one another, comparing the generalised subpoissonian statistics with extant signatures of nonclassical behaviour.
Item Type:  Preprint 

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Additional Information:  J.Phys. A31 (1998) 565583 
Department/Centre:  Division of Physical & Mathematical Sciences > Physics Division of Physical & Mathematical Sciences > Centre for Theoretical Studies 
Date Deposited:  31 Jul 2004 
Last Modified:  19 Sep 2010 04:13 
URI:  http://eprints.iisc.ernet.in/id/eprint/900 
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