| Autor: |
Huber, Daniel, Reindl, Marcus, da Silva, Saimon Filipe Covre, Schimpf, Christian, Martin-Sanchez, Javier, Huang, Huiying, Piredda, Giovanni, Edlinger, Johannes, Rastelli, Armando, Trotta, Rinaldo |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. Lett. 121, 033902 (2018) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.121.033902 |
| Popis: |
Entangled photon generation from semiconductor quantum dots via the biexciton-exciton cascade underlies various decoherence mechanisms related to the solid-state nature of the quantum emitters. So far, this has prevented the demonstration of nearly-maximally entangled photons without the aid of inefficient and complex post-selection techniques that are hardly suitable for quantum communication technologies. Here, we tackle this challenge using strain-tunable GaAs quantum dots driven under two-photon resonant excitation and with strictly-degenerate exciton states. We demonstrate experimentally that our on-demand source generates polarization-entangled photons with fidelity of 0.978(5) and concurrence of 0.97(1) without resorting to post-selection techniques. Moreover, we show that the remaining decoherence mechanisms can be overcome using a modest Purcell enhancement so as to achieve a degree of entanglement >0.99. Our results highlight that GaAs quantum dots can be readily used in advanced communication protocols relying on the non-local properties of quantum entanglement. |
| Databáze: |
arXiv |
| Externí odkaz: |
|
