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.