Yup, that's pretty much it, for the 12s it's active, you get about 40k damage if you have at least 80 points in Particle gens and phaser tac consoles. That is, if you keep your target in the 45 degree arc.

In a science ship, you'll want high particle gens anyway. And you might want to use the (phaser) Aux cannons. Then the cost of running the Quantum focused phaser is just one console slot. Your choice whether to use it or not.