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You can find several free resources and platforms for downloading the PDF, which is a popular exam-focused guide for engineering students (particularly those under AKTU). Direct PDF Downloads

Digital electronics deals with discrete signals, logic gates (AND, OR, NOT), and binary arithmetic. However, as transistor sizes shrink to the atomic level, quantum phenomena begin to affect circuit performance.

The second half of your keyword——represents a paradigm shift. Where a classical bit is either 0 or 1, a qubit can be in a superposition of both states simultaneously.