Proceedings of the National Academy of Sciences, Volume 122, Issue 27, July 2025. SignificanceQuantum discord is a measure of the quantum correlations that exist between subsystems of a quantum state. Initially defined for two subsystems, it was recently extended to multipartite systems, but has never been experimentally measured. In …
Observations from the Little Bunker
Last updated: August 18, 2025 04:13 PM
Atmospheric CO₂
425.4 ppm
+18.4
ppm/year
Atmospheric CH₄
1934.91 ppb
+9.11
ppb/year
Global Temperature
+1.48 °C
Peak: +1.73°C
World Population
8.1 billion
+67
million/year