title: High yield and ultrafast sources of electrically triggered entangled-photon pairs based on strain-tunable quantum dots.
abstract: Triggered sources of entangled photon pairs are key components in most quantum communication protocols. For practical quantum applications, electrical triggering would allow the realization of compact and deterministic sources of entangled photons. Entangled-light-emitting-diodes based on semiconductor quantum dots are among the most promising sources that can potentially address this task. However, entangled-light-emitting-diodes are plagued by a source of randomness, which results in a very low probability of finding quantum dots with sufficiently small fine structure splitting for entangled-photon generation (∼10(-2)). Here we introduce strain-tunable entangled-light-emitting-diodes that exploit piezoelectric-induced strains to tune quantum dots for entangled-photon generation. We demonstrate that up to 30% of the quantum dots in strain-tunable entangled-light-emitting-diodes emit polarization-entangled photons. An entanglement fidelity as high as 0.83 is achieved with fast temporal post selection. Driven at high speed, that is 400 MHz, strain-tunable entangled-light-emitting-diodes emerge as promising devices for high data-rate quantum applications.
authors.affiliation: Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.
authors.forename: Jiaxiang
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Johannes S
authors.initials: JS
authors.lastname: Wildmann
authors.affiliation: Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.
authors.forename: Fei
authors.identifier: http://orcid.org/0000-0003-2923-4815
authors.initials: F
authors.lastname: Ding
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Rinaldo
authors.initials: R
authors.lastname: Trotta
authors.affiliation: Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.|Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Yongheng
authors.initials: Y
authors.lastname: Huo
authors.affiliation: Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.
authors.forename: Eugenio
authors.initials: E
authors.lastname: Zallo
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Daniel
authors.initials: D
authors.lastname: Huber
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Armando
authors.initials: A
authors.lastname: Rastelli
authors.affiliation: Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.|Material Systems for Nanoelectronics, TU Chemnitz, 09107 Chemnitz, Germany.
authors.forename: Oliver G
authors.initials: OG
authors.lastname: Schmidt