aiqbench takeQuantum Computing

The team reports a Bell inequality violation (S ≈ 2.675, over 13 standard deviations above the classical limit 2) using time-bin entanglement from a single InAs quantum dot in a micropillar cavity. The approach avoids generating multiple photons, which could simplify solid-state entangled-photon sources, but the results come from a single laboratory demonstration, and scalability remains unproven.

Sources coveringQuantum Zeitgeist, arXiv, Quantum Computing Report

Photons from a quantum dot prove entanglement over time

Quantum ZeitgeistOctober 30, 20267 min read

Researchers demonstrated Bell inequality violation using time-entangled photons emitted from a quantum dot, a key step for advanced quantum technologies.

Researchers at the Beijing Academy of Quantum Information Sciences have demonstrated entanglement not just across space, but across time, using a single quantum dot. The team reports violating the Clauser-Horn-Shimony-Holt Bell inequality by creating and manipulating “vacuum–one-photon number superposition states,” where a photon either exists or does not. This approach bypasses the need to generate multiple photons, simplifying the creation of entangled photons from a solid-state source and offering a scalable pathway for future quantum technologies. Bang Wu of the Beijing Academy of Quantum Information Sciences and colleagues detail their findings in a new study. Researchers observed a Bell inequality violation with a parameter S reaching 2. 675(0.050), exceeding the classical limit of 2 by over 13 standard deviations, confirming the non-local nature of the generated quantum state. This result stems…

Excerpt shown under the publisher's RSS terms · 131 words · full text and figures are on the publisher's site

Read at Quantum Zeitgeist ↗Ask about this article