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- W3203090763 abstract "The method of quantum Lanczos recursion is extended to solve for multiple excitations on the quantum computer. While quantum Lanczos recursion is in principle capable of obtaining excitations, the extension to a block Lanczos routine can resolve degeneracies with better precision and only costs $mathcal{O}(d^2)$ for $d$ excitations on top of the previously introduced quantum Lanczos recursion method. The formal complexity in applying all operators to the system at once with oblivious amplitude amplification is exponential, but this cost can be kept small to obtain the ground state by incrementally adding operators. The error of the ground state energy based on the accuracy of the Lanczos coefficients is investigated and the error of the ground state energy. It is demonstrated to scale linearly with the uncertainty of the Lanczos coefficients. Extension to non-Hermitian operators is also discussed." @default.
- W3203090763 created "2021-10-11" @default.
- W3203090763 creator A5043658619 @default.
- W3203090763 date "2021-09-29" @default.
- W3203090763 modified "2023-09-27" @default.
- W3203090763 title "Block Lanczos method for excited states on a quantum computer" @default.
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