Hello Disha!

It is fascinating to see your interest in quantum physics, however, if you want to choose quantum physics as your specialization, firstly you can choose to apply for a B.Sc in Physics course, wherein you would get few courses in quantum physics and your fundamentals about the topic would be clear. For example, in Delhi University, if you get admitted for B.Sc Physics (Honours) course then you would get to learn a lot about quantum physics and probably three courses would be solely dependent on that. Instead, you can choose to apply for integrated BS+MS courses from IISc. In India, you would have to firstly complete your bachelor's in physics, then you can opt for Master's in Physics choosing quantum physics as your specialization. However, in many institutes Bachelor's in Physics course has a lot of Quantum Physics in its curriculum and so you would get your basics correct and then you can give entrance exams for IISC, IITs through IITJAM, DU, BHU etc and choose quantum physics as your specialization. Also, after your master's you can go for research in this field by clearing the exams like TIFR, IISER etc.

Hope this helps you.