Question

what is quantum theory?dont copy....​

Answer 1

In physics, the no-cloning theorem states that it is impossible to create an identical copy of an arbitrary unknown quantum state. ... It has profound implications in quantum computing and related fields.

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Answer 2

Technically, quantum theory is actually the theory of any objects isolated from their surroundings but, because it is very difficult to isolate large objects from their environments, it essentially becomes a theory of the microscopic world of atoms and sub-atomic particles. This is especially true for those parts of the theory which rely on the absolute indistinguishability of fundamental particles, an indistinguishability which is impossible to find in the everyday world of composite, large-scale objects.