Scientists achieve high-efficiency single-photon source above loss-tolerant threshold

https://phys.org/news/2025-04-scientists-high-efficiency-photon-source.html

"scalable linear optical quantum computing feasibility needs >2/3 single-photon source efficiency, compensating for photons lost during computations... tunable open optical microcavity precisely coupling quantum dots/ microcavities in both resonance frequency/ spatial positioning (1.89(14) dB intensity squeezing, 1.67 mHz count rate)... tailor-shapes laser pulse excitation on high-quantum efficiency single quantum dot... 71.2% system efficiency, 80.6% extraction efficiency exceeding 2/3 threshold for first time"

Related: Single-photon source based on topological bulk cavity
https://www.eurekalert.org/news-releases/1096818