Abstract: A method for acquiring an eigenstate of a quantum system includes performing cluster division on multiple particles included in a target quantum system to obtain multiple clusters, where each cluster includes one or more particles, obtaining multiple direct product states according to eigenstates respectively corresponding to the multiple clusters, selecting some direct product states from the multiple direct product states as a set of basis vectors to represent a compressed Hilbert space, acquiring a Hamiltonian of the target quantum system and an equivalent Hamiltonian in the compressed Hilbert space, and acquiring an eigenstate and eigenenergy of the equivalent Hamiltonian as an eigenstate and eigenenergy of the target quantum system.

Abstract: The present specification provides answer text processing methods and apparatuses and key text determination methods. In some embodiments, based on the previously described data processing methods, a piece of answer text that corresponds to a target question is determined from a predetermined knowledge base as a piece of target answer text at first; then one or more key texts that are closely associated with the target question and corresponds to a relatively high user attention measure is recognized and determined from the piece of target answer text, and the previously described key text in the piece of target answer text is labeled; and furthermore, the previously described key text can be identified in the piece of target answer text displayed to a user. Therefore, the user can read relatively valuable key information that the user needs in the piece of target answer text conveniently and efficiently.