Secrecy is not a strategy for preventing this discovery from having a dramatic impact on the world. Its a trick. It will have an impact, regardless.
The one who has the knowledge is therefore and perpetually advantaged over all others in the world. Are they so benevolent and good as to be trusted with perpetual advantage?
This advantage will play out in ways that you can't predict. You can't control what decades or centuries of disadvantage will produce for everyone else.
Control is an illusion. You can't control access to technology or knowledge or even resources. It's inevitably a failure, and then another has advantage over most everyone.
You can, however, prepare yourself and get your own power. Make sure you're expensive to attack. Make sure the gain is small and the cost is high. If everyone has this power, instead of the 1-2 who managed to develop it or steal it, then it doesn't matter when the next person learns it. Also, everyone has prepared for it. They have bunkers, masks and other tools to minimize the damage in an attack.