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.
Highlights
Triggered sources of entangled photon pairs are key components in most quantum communication protocols
To quantify this probability in our straintunable ELED (ST-ELED), we use the following approach: we study the evolution of the fidelity to the maximally entangled Bell state |C þ i as a function of the fine structure splitting (FSS) for one single quantum dots (QDs) and we use the obtained result to estimate at which value of the FSS it is possible to overcome the classical limit
We have presented ST-ELEDs in which anisotropic strain fields are used to tune QDs for entangled-photon generation
Summary
Triggered sources of entangled photon pairs are key components in most quantum communication protocols. This results in the generation of zero or multiple entangled-photon pairs in most excitation cycles and unavoidably limits the success of realizing deterministic photonic quantum technologies These complications could be alleviated by employing solid-state quantum systems such as colour centres in diamond[6], intrinsic defects in silicon carbide[7] and semiconductor quantum dots (QDs)[8]. They exhibit atomic-like optical transitions and allow the generation of deterministic single photons. Using piezoelectric-induced strains to engineer the properties of ELEDs would be highly desirable, because this fully electro-mechanically controlled tuning knob would allow the problems related to the FSS in ELEDs to be overcome
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