Rayitsu18

Hi everybody! I am trying to find the difference between density fitting (DF) and resolution of the Identity (RI) approximations. I have read the following in the article [J. Chem. Phys. 118, 8149 (2003)]: "Density fitting mathematically resembles a resolution of the identity RI in the specific case where the fitting criterion and target integral type coincide. However, RIs in quantum mechanics usually involve a summation over states and an implied overlap metric, neither of which appear in density fitting. Furthermore RIs do not offer a framework in which to discuss fitting criteria, constraints or robust fitting." I still do not know what this exactly means. Could anyone give me a hand? Thank you in advance!

I was thinking about calculating the number of bits which would correspond to 10^(2,000,000) books and see if it is possible to represent it with a quantum computer.

Hello everybody!I was wondering if someone can give me a hand with this problem:We have a tape in which three bits are repeated in succession, say 110110110110... For a 3N-bit tape, what is the fuel value? How do you get it out?Thank you so much!!! Any help will be welcome

Hello!If the Library of Babel has 10^(2,000,000) books, does anyone think that it is possible to create a quantum state (with a quantum computer) that represents this Library? I think that in a classical way it is impossible, but in a quantum way?I find it quite interesting! What about you?