Quantum-tomography of entangled photon pairs by quantum-dot cascade decay

Abstract

We compute the concurrence of the polarization-entangled photon pairs generated by the biexciton cascade decay of a semiconductor quantum dot. We show how a cavity-induced increase of the photon rate emission reduces the detrimental effect of the dot dephasing and of the excitonic fine structure. However, strong dot-cavity couplings and finite detection efficiencies are shown to reduce the relevance of the desired cascade decay with respect to that of competing processes. This affects the merits of the entangled photon-pair source, beyond what estimated by the quantum-tomography.

References in corpus (2)

• Entangled Photon Pairs from Semiconductor Quantum Dots
• Improved fidelity of triggered entangled photons from single quantum dots

Cited by in corpus (9)

• Coherence of an Entangled Exciton-Photon State
• Phonon-assisted decoherence in the production of polarization-entangled photons in a single semiconductor quantum dot
• Mode identification of high-quality-factor single-defect nanocavities in quantum dot-embedded photonic crystals
• Entangled photon pairs from a quantum dot cascade decay: the effect of time-reordering
• Bell inequalities and density matrix for polarization entangled photons out of a two-photon cascade in a single quantum dot
• Distilling entanglement from cascades with partial "Which Path" ambiguity
• Electrostatic control of quantum dot entanglement induced by coupling to external reservoirs
• Nonclassical Correlation of Polarization Entangled Photons in a Biexciton-Exciton Cascade
• All-optical non-demolition measurement of single-hole spin in a quantum-dot molecule