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Thesis

#### Generation of Correlated Photon Pairs in a Quantum System with Broken Inversion Symmetry

##### Fulltext (public)

oster_final120911.pdf

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##### Supplementary Material (public)

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##### Citation

Oster, F. (2011). Generation of Correlated Photon Pairs in a Quantum System with Broken Inversion Symmetry. Diploma Thesis, Ruprecht-Karls-Universität, Heidelberg, Germany.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0012-1BE4-E

##### Abstract

The aim of our work is to investigate a pumped two-level system with broken inversion
symmetry (intrinsic dipole moments of the two levels differ). We choose a semiclassical
description for the interaction with the laser and additionally take into account
a quantized environment giving rise to effects of spontaneous emission. We further
choose a perturbative approach to derive the equations of motion in a master equation
approach. An off-resonant laser induces the emission of a THz-photon and the emission
of an optical photon, whose quantum intensity-intensity correlation function we calculate.
This function gives a measure for the probability of detecting one photon right
after the other. Moreover, we observe the violation of a Cauchy-Schwarz inequality that
brings us to the conclusion that we are dealing with a non-classical pair of correlated
photons, which are important in the emerging field of quantum information science.
This theoretical model may, for example, be applied to gamma globulin molecules or
quantum dots. In this thesis we perform the numerical calculations with the parameters
of gamma globulin molecules.