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De las Cuevas, G. ; Cubitt, J.L. ; Wolf, M.M. ; Pérez García, David | American Institute of Physics Inc. | 2016We show a fundamental limitation in the description of quantum many-body mixed states with tensor networks in purification form. Namely, we show that there exist mixed states which can be represented as a translationally invariant (TI) matrix pr[...]texto impreso
We show how a vector-valued version of Schechtmans empirical method can be used to reduce the number of questions in a nonlocal game G while preserving the quotient ?*(G)/?(G) of the quantum over the classical bias. We apply our method to the Kh[...]
