Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-10-28
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 10 figures, 1 table, submitted to phys. rev. B
Scientific paper
We theoretically study the polarization entanglement of photons generated by the biexciton cascade in a GaAs/InAs semiconductor quantum dot (QD), located in a nano cavity. A detailed analysis of the complex interplay between photon- and carrier coherences and phonons which occurs during the cascade allows us to clearly identify where the entanglement is generated and destroyed. A quantum state tomography is performed for varying exciton fine structure splittings. By constructing an effective multi-phonon Hamiltonian which couples the continuum of the wetting layer states to the QD we investigate the relaxation of the biexciton and exciton states. This consistently introduces a temperature dependence to the cascade. Considering typical Stranski-Karastanov grown QDs, for temperatures around 80 K the degree of entanglement starts to be affected by the dephasing of the exciton states and is ultimately lost above 120 K.
Carmele Alexander
Dachner M.-R.
Harouni Bagheri M.
Knorr Andreas
Milde Frank
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