Quantum Computing - Lecture Notes
2.2 Postulate 2: Evolution of quantum systems Postulate 2 (Nielsen and Chuang, page 81): “The evolution of a closed quantum system is described by a unitary transformation. That is, the state j ψ i of the system at time t1 is related to the state of ψ 0 of the system at time t2 by a unitary operator U which depends only on times t1 and t2. ...
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