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Título : Strain-Tunable GaAs Quantum dot - A Nearly Dephasing-Free Source of Entangled Photon Pairs on Demand
Autor : Huber, Daniel
Reindl, Marcus
Filipe Covre da Silva, Saimon
Schimpf, Christian
Martín-Sánchez, Javier
Huang, Huiying
Piredda, Giovanni
Edlinger, Johannes
Rastelli, Armando
Trotta, Rinaldo
Palabras clave : Física
óptica cuántica
Fecha de publicación : 18-jul-2018
Editorial : APS (American Physical Society)
Citación : Daniel Huber, Marcus Reindl, Saimon Filipe Covre da Silva, Christian Schimpf, Javier Martín-Sánchez, Huiying Huang, Giovanni Piredda, Johannes Edlinger, Armando Rastelli, Rinaldo Trotta. Strain-Tunable GaAs Quantum Dot: A Nearly Dephasing-Free Source of Entangled Photon Pairs on Demand. Phys. Rev. Lett. 2018; 121; 033902
Resumen : We report on the observation of nearly maximally-entangled photon pairs from semiconductor quantum dots, without resorting to post-selection techniques. We use GaAs quantum dots integrated on a patterned piezoelectric actuator capable of suppressing the exciton fine structure splitting. By using a resonant two-photon excitation we coherently drive the biexciton state and demonstrate experimentally that our device generates polarization-entangled photons with a fidelity of 0.978(5) and a concurrence of 0.97(1) taking into account the nonidealities stemming from the experimental setup. By combining fine-structure-dependent fidelity measurements and a theoretical model, we identify an exciton spin-scattering process as a possible residual decoherence mechanism. We suggest that this imperfection may be overcome using a modest Purcell enhancement so as to achieve fidelities >0.99, thus making quantum dots evenly matched with the best probabilistic entangled photon sources.
URI : https://ria.asturias.es/RIA/handle/123456789/12625
Aparece en las colecciones: Física
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