In quantum computing, a qubit or quantum bit (sometimes qbit) is the basic unit of quantum information: Y
Yocto (symbol y) is a unit prefix in the metric system denoting a factor of 10−24 or 0.000000000000000000000001.
It was adopted in 1991 by the General Conference on Weights and Measures. It comes from the Latin/Greek octo/οκτώ, meaning “eight”, because it is equal to 1000−8. Yocto- is the smallest official SI prefix.
It can be used to state a subatomic particle’s mass, for example:
Rest mass of electron: 0.000911 yg
Rest mass of proton: 1.6726 yg
Rest mass of neutron: 1.6749 yg
Atomic mass unit: 1.6605 yg