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- W4224081481 abstract "We propose a quantum-classical hybrid scheme for implementing the nonunitary Gutzwiller factor using a discrete Hubbard-Stratonovich transformation, which allows us to express the Gutzwiller factor as a linear combination of unitary operators involving only single-qubit rotations, at the cost of the sum over the auxiliary fields. To perform the sum over the auxiliary fields, we introduce two approaches that have complementary features. The first approach employs a linear-combination-of-unitaries circuit, which enables one to probabilistically prepare the Gutzwiller wave function on a quantum computer, while the second approach uses importance sampling to estimate observables stochastically, similar to a quantum Monte Carlo method in classical computation. The proposed scheme is demonstrated with numerical simulations for the half-filled Fermi-Hubbard model. Furthermore, we perform quantum simulations using a real quantum device, demonstrating that the proposed scheme can reproduce the exact ground-state energy of the two-site Fermi-Hubbard model within error bars." @default.
- W4224081481 created "2022-04-19" @default.
- W4224081481 creator A5048160827 @default.
- W4224081481 creator A5054352157 @default.
- W4224081481 creator A5068173013 @default.
- W4224081481 date "2022-04-13" @default.
- W4224081481 modified "2023-09-29" @default.
- W4224081481 title "Gutzwiller wave function on a quantum computer using a discrete Hubbard-Stratonovich transformation" @default.
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