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Title:Learning quantum states

´¡²ú²õ³Ù°ù²¹³¦³Ù:ÌýSuppose we are given a sequence of quantum registers initialized to the same quantum state rho, and would like to learn the state rho. That is, we would like to design an algorithm that produces a classical description of an approximation to the state. How many copies of rho dowe need to be able to produce a suitable approximation? This talk will be a gentle introduction to the problem and related results.