2008/10/22 by Matthieu Larqué, Timothy Karle, T. J. Karle +4
Engineering · Physics and Astronomy · #Biexciton #Cascade #Coincidence counting #Optics #Optoelectronics #Photon #Photon entanglement #Photonic Crystals and Applications #Photonic and Optical Devices #Photonic crystal #Physics #Polarization (electrochemistry) #Quantum #Quantum dot #Quantum entanglement #Quantum mechanics #Semiconductor Quantum Structures and Devices #Spontaneous parametric down-conversion #quant-ph
paper · pdf · doi:10.1088/1367-2630/11/3/033022
arxiv created 2008/10/22 · openalex publication_date 2009/03/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We report on the theoretical investigation of photonic crystal cavities etched on a suspended membrane for the generation of polarization entangled photon pairs using the biexciton cascade in a single quantum dot. The implementation of the spontaneous emission enhancement effect increases the entanglement visibility, while the concomitant preferential funneling of the emission in the cavity mode increases the collection of both entangled photons. We demonstrate and quantify that standard cavity designs present a polarization-dependent emission diagram, detrimental to entanglement. The optimization of H1 cavities allows us to obtain both high collection efficiencies and polarization-independent emission, while keeping the high Purcell factors necessary for high-quality entangled photon sources.