David Deutsch proposed a universal quantum model of computation in 1985 and formulated a physical version of the physical Church-Turing principle. His argument treated the laws governing a computing device as part of the theory of computation, rather than as an implementation detail.[ref]
Quantum theory, the Church-Turing principle and the universal quantum computer by David Deutsch. Abstract and universal-computer construction
A quantum device evolves amplitudes through permitted quantum operations, which can produce behaviour unavailable to the corresponding classical restriction. This motivates universal quantum computation; it does not mean that reading one quantum state returns every amplitude or that every computational problem automatically becomes easy.
Articles by others on the same topic
David Deutsch is a British physicist and philosopher renowned for his work in the fields of quantum physics and the foundations of computation. He is particularly known for his contributions to quantum computing, including the development of the concept of a universal quantum computer. Deutsch is also recognized for his ideas on the multiverse interpretation of quantum mechanics and for his advocacy of the philosophical implications of scientific theories.