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• W2254754114 abstract "The preparation of quantum states using short quantum circuits is one of the most promising near-term applications of small quantum computers, especially if the circuit is short enough and the fidelity of gates high enough that it can be executed without quantum error correction. Such quantum state preparation can be used in variational approaches, optimizing parameters in the circuit to minimize the energy of the constructed quantum state for a given problem Hamiltonian. For this purpose we propose a simple-to-implement class of quantum states motivated by adiabatic state preparation. We test its accuracy and determine the required circuit depth for a Hubbard model on ladders with up to 12 sites (24 spin-orbitals), and for small molecules. We find that this ansatz converges faster than previously proposed schemes based on unitary coupled clusters. While the required number of measurements is astronomically large for quantum chemistry applications to molecules, applying the variational approach to the Hubbard model (and related models) is found to be far less demanding and potentially practical on small quantum computers. We also discuss another application of quantum state preparation using short quantum circuits, to prepare trial ground states of models faster than using adiabatic state preparation." @default.
• W2254754114 created "2016-06-24" @default.
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• W2254754114 date "2015-10-02" @default.
• W2254754114 modified "2023-10-17" @default.
• W2254754114 title "Progress towards practical quantum variational algorithms" @default.
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• W2254754114 doi "https://doi.org/10.1103/physreva.92.042303" @default.
• W2254754114 hasPublicationYear "2015" @default.
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