# Can every process in nature be simulated by a Turing Machine or a quantum computer?

Given any initial condition or value A, A leads to B after a procedure of physics or nature P. Now is there any turing machine or quantum computer that can simulates P,converting A into B? In other word, is any cause-effect relation in nature computable?

• Hi @XL_At_Here_There, welcome to QCSE. It seems like you are asking if a quantum Turing machine simulate a Laplace Demon. But right now the wording of the question is a bit confusing. Can you consider revising your question in the formalism of quantum computing, if you can? Are $A$ and $B$ states, and $P$ an operation acting on $A$ to convert it to $B$? – Mark S Apr 24 '20 at 17:19
• states？ maybe， but it does not matter. – XL _At_Here_There Apr 26 '20 at 11:55
• I would counsel you to make an effort to clarify your question, or accept @gIS's already informed answer. – Mark S Apr 26 '20 at 18:02