Measuring signals smaller than 1 zeptojoule

From:

New quantum sensor could count individual photons and hunt dark matter Scientists just detected one of the tiniest energy signals ever measured — a breakthrough that could transform quantum computing and dark matter searches. Date: May 20, 2026 Source: Aalto University Summary: Researchers have built an ultra-sensitive sensor capable of detecting unimaginably small amounts of energy — below one zeptojoule. The breakthrough relies on fragile superconducting materials that react to even the slightest temperature change. This level of precision could improve quantum computers, enable photon counting, and even help scientists detect elusive dark matter particles from space.

FYI: The unit 'zepto' stands for 10^-21 Had to google it... Zepto is a metric prefix that denotes a factor of one quintillionth (10⁻²¹),

zepto Farad, not used yet... :-)

There is also 'yocto' 10^-24