I searched the article for the letter "Q", and did not find anything. Any idea of how usefull the laser can be ?
A fusion energy gain factor, usually expressed with the symbol Q, is the ratio of fusion power produced in a nuclear fusion reactor to the power required to maintain the plasma in steady state. The condition of Q = 1, when the power being released by the fusion reactions is equal to the required heating power, is referred to as breakeven, or in some sources, scientific breakeven.
TL;DR: high Q = free unlimited energy!!!! low Q = "fusion is 30 years away"
The real LPT is always in the comments.