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- W4322724186 abstract "Abstract Imaginary-time evolution plays an important role in many areas of quantum physics and has been widely applied to the ground-state determination of various Hamiltonian in the quantum computation field. In this work, we propose an iteration-free quantum algorithm in a full gate-based frame using the approximate unitary expansion to simulate the imaginary-time evolution operator, avoiding the resource overhead caused by repeated measurement for state reconstruction or complex pre-calculations in the classical computers. We detail the algorithm and analyze the complexity and related characteristics including a lower bound for ancillary qubits at a given success probability. Then an application demonstration of the algorithm in quantum chemistry with hydrogen molecule under noiseless and noisy conditions is offered. In addition, we present another imaginary-time evolution simulation method based on similar construction schemes. Our algorithms can serve as the alternative proposals for the imaginary-time evolution realization in the future fault-tolerant quantum computers." @default.
- W4322724186 created "2023-03-03" @default.
- W4322724186 creator A5019231167 @default.
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- W4322724186 date "2023-03-01" @default.
- W4322724186 modified "2023-10-18" @default.
- W4322724186 title "Iteration-free digital quantum simulation of imaginary-time evolution based on the approximate unitary expansion" @default.
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- W4322724186 doi "https://doi.org/10.1209/0295-5075/acc052" @default.
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