Many-fermion simulation from the contracted quantum eigensolver without fermionic encoding of the wave function
Many-fermion simulation from the contracted quantum eigensolver without fermionic encoding of the wave function
复制标题
来自收缩量子本征解算器的多费米子模拟,无需波函数的费米子编码
DOI:
10.1103/physreva.105.062424
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发表时间:
2022
影响因子:
2.9
通讯作者:
Mazziotti, David A.
中科院分区:
文献类型:
--
作者:
Smart, Scott E.;Mazziotti, David A.
Quantum computers potentially have an exponential advantage over classical computers for the quantum simulation of many-fermion quantum systems. Nonetheless, fermions are more expensive to simulate than bosons due to the fermionic encoding—a mapping by which the qubits are encoded with fermion statistics. Here we generalize the contracted quantum eigensolver (CQE) to avoid fermionic encoding of the wave function. In contrast to the variational quantum eigensolver, the CQE solves for a many-fermion stationary state by minimizing the contraction (projection) of the Schrödinger equation onto two fermions. We avoid fermionic encoding of the wave function by contracting the Schrödinger equation onto an unencoded pair of particles. Solution of the resulting contracted equation by a series of unencoded two-body exponential transformations generates an unencoded wave function from which the energy and two-fermion reduced density matrix (2-RDM) can be computed. We apply the unencoded and the encoded CQE algorithms to the hydrogen fluoride molecule, the dissociation of oxygen, and a series of hydrogen chains. Both algorithms show comparable convergence towards the exact ground-state energies and 2-RDMs, but the unencoded algorithm has computational advantages in terms of state preparation and tomography.
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DOI:
--
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期刊:
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