Reducing molecular electronic Hamiltonian simulation cost for Linear Combination of Unitaries approaches
In: Quantum Science and Technology, 8 (3) 035019, 2023; (2022)
Online
report
We consider different Linear Combination of Unitaries (LCU) decompositions for molecular electronic structure Hamiltonians. Using these LCU decompositions for Hamiltonian simulation on a quantum computer, the main figure of merit is the 1-norm of their coefficients, which is associated with the quantum circuit complexity. It is derived that the lowest possible LCU 1-norm for a given Hamiltonian is half of its spectral range. This lowest norm decomposition is practically unattainable for general Hamiltonians; therefore, multiple practical techniques to generate LCU decompositions are proposed and assessed. A technique using symmetries to reduce the 1-norm further is also introduced. In addition to considering LCU in the Schr\"odinger picture, we extend it to the interaction picture, which substantially further reduces the 1-norm.
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Reducing molecular electronic Hamiltonian simulation cost for Linear Combination of Unitaries approaches
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Autor/in / Beteiligte Person: | Loaiza, Ignacio ; Khah, Alireza Marefat ; Wiebe, Nathan ; Izmaylov, Artur F. |
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Quelle: | Quantum Science and Technology, 8 (3) 035019, 2023; (2022) |
Veröffentlichung: | 2022 |
Medientyp: | report |
DOI: | 10.1088/2058-9565/acd577 |
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