Hey Gokul! Thanks for contacting careers 360.

The available jobs opportunities for mechatronics are as follows - 

Jobs related to quality control

Plc maintenance or plc programming areas

If you get a job related to industrial robots you may work on industrial robots and automation related areas 

In companies related to aeronautics one will work in aeronautics and avionics.

And as for quantum mechanics - 

Quantum researcher

Simulation engineer

System administrator

Applications scientist

Maintenance controller

Wish you all the best!