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Optics and Spectroscopy

, Volume 108, Issue 2, pp 197–205 | Cite as

Characterizing nonclassicality and entanglement

  • W. VogelEmail author
  • T. Kiesel
  • J. Sperling
Quantum Informatics. Entangled States
  • 84 Downloads

Abstract

In Quantum Optics, the widely accepted definition of nonclassicality is based on the P function of Glauber and Sudarshan. When it fails to be interpreted as a classical probability density, the corresponding quantum state is said to be a nonclassical one. Here we present the first reconstruction of a nonclassical P function of a single-photon added thermal state. We also consider the nonclassical properties of general spacegtime dependent correlation functions of radiation fields. For the detection of these correlation functions, a balanced homodyne correlation technique was proposed. It is shown that the measurable correlation functions also allow one to completely characterize bipartite entangled quantum states with a negative partial transposition. Finally, we present a method for identifying general bipartite entanglement for continuous variables.

Keywords

Quantum State Entangle State Bipartite Entanglement Entanglement Witness Nonclassical Property 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  1. 1.Arbeitsgruppe Quantenoptik, Institut für PhysikUniversität RostockRostockGermany

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