Abstract
We study the quantum properties and statistics of photons emitted by a quantum-dot biexciton inside a cavity. In the biexciton-exciton cascade, fine-structure splitting between exciton levels degrades polarization-entanglement for the emitted pair of photons. However, here we show that the polarization-entanglement can be preserved in such a system through simultaneous emission of two degenerate photons into cavity modes tuned to half the biexciton energy. Based on detailed theoretical calculations for realistic quantum-dot and cavity parameters, we quantify the degree of achievable entanglement.
Highlights
One of the key aspects on our way into the age of quantum-information is the identification of efficient sources of entangled photons [1]
We investigate the generation of polarization-entangled photon pairs by two-photon emission from quantum dots (QDs) biexcitons
For a realistic high-quality QD cavity system, we have theoretically investigated the generation of polarization-entangled photon pairs by direct two-photon emission from QD biexcitons
Summary
One of the key aspects on our way into the age of quantum-information is the identification of efficient sources of entangled photons [1]. Cavity-assisted emission of polarization-entangled photons from biexcitons in quantum dots with fine-structure splitting Fine-structure splitting between exciton levels degrades polarization-entanglement for the emitted pair of photons.
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