L. J. Salazar, D. A. Guzmán, F. J. Rodríguez, L. Quiroga
The dependence of the excitonic two-photon absorption on the quantum
correlations (entanglement) of exciting biphotons by a semiconductor quantum
well is studied. We show that entangled photon absorption can display very
unusual features depending on space-time-polarization biphoton parameters and
absorber density of states for both bound exciton states as well as for unbound
electron-hole pairs. We report on the connection between biphoton entanglement,
as quantified by the Schmidt number, and absorption by a semiconductor quantum
well. Comparison between frequency-anti-correlated, unentangled and
frequency-correlated biphoton absorption is addressed. We found that exciton
oscillator strengths are highly increased when photons arrive almost
simultaneously in an entangled state. Two-photon-absorption becomes a highly
sensitive probe of photon quantum correlations when narrow semiconductor
quantum wells are used as two-photon absorbers.
View original:
http://arxiv.org/abs/1109.6895
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