Research and experiments into weapons-related nuclear fusion and commercial energy fusion are highly entangled, and have been notably so since the 1950s, after the Soviets conducted their “layer cake” ...

Compare that with nuclear fusion, which takes place beginning at over 10,000 degrees. But it’s a million times hotter than the usual temperatures for quantum entanglement on anything like this ...

More information: Qi Liu et al, Multiphoton path-polarization entanglement through a single gradient metasurface, Advanced Photonics Nexus (2025).DOI: 10.1117/1.APN.4.2.026002 ...

Excitons, encountered in technologies like solar cells and TVs, are quasiparticles formed by an electron and a positively charged "hole," moving together in a semiconductor.