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Is a 2nd course on Quantum Mechanics helpful for research in Quantum Information/Computing?

I'm wavering between taking 2nd Quantum Mechanics course and not. I've just completed the 1st course that already covered fundamentals of QC. I intend to take Quantum Information Processing along with Quantum Mechanics 2 next semester, but recently I've read some opinions that advanced QM will not be very helpful for doing (serious) research in Quantum Information/Computing. Can someone confirm whether perturbation theory has anything to do with QI/QC? I really want to expand my knowledge in QM, but the course is very challenging so I don't want to waste much time for something I'll barely use.