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Researchers demonstrated an electrically driven quantum dot light source that emits circularly polarized single photons without optical pumping, and reported that spin-injection changes affect two-photon correlations. For quantum hardware readers, the practical question is whether electrical excitation can be scaled and made reproducible, since the work is at the device-physics stage and the reported 60% reduction in fluctuations applies to a specific lab setup.

Surse care acoperăQuantum Zeitgeist, arXiv, Quantum Computing Report

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Researchers Link Photon Fluctuations to Electron Spin Control

Quantum Zeitgeist2 noiembrie 20264 min de cititArticolul și perspectiva sunt în engleză.

Resolving |2⟩ Fock states, the distinct emission of two photons, has long required external optical pumping; now, electrical control achieves this directly within an ensemble of quantum dots. This advance unlocks microelectronics-compatible quantum light sources without laser excitation, surpassing previous methods reliant on optical triggering. Demonstrating command over both photon polarization *and* these higher-order correlations establishes new pathways toward integrated quantum technologies.

An electrically driven light source using ensembles of indium gallium arsenide/gallium arsenide quantum dots emits circularly polarized single photons without needing external laser pumping. The device directly converts electrical charge and spin into photon emission; key fluctuations observed when detecting pairs of emitted photons disappear upon demagnetizing the layer used to inject electrons with specific spins. Electrically driven light emission was achieved using semiconductor structures called quantum dots, creating circularly polarized photons without requiring external lasers,…

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