arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2005.14475quant-ph
收藏

用于量子计算化学的高效量子线路

Efficient quantum circuits for quantum computational chemistry

Yordan S. Yordanov, David R. M. Arvidsson-Shukur, Crispin H. W. Barnes

摘要:

采用变分量子本征求解器(VQE)的分子量子模拟依赖于近似于分子基态的基态。这些量子态通常由参数化的费米子激发算符和初始参考态定义。有效的方法来执行费米子激发是至关重要的噪声中等规模量子计算机上实现的VQE。在这里,我们解决这个问题,首先演示电路,执行量子位激发,激发不占费米反对易关系。然后,我们扩展这些电路的功能,以执行费米激发。与标准使用“$CNOT$阶梯”构造的电路相比,我们的电路提供了$CNOT$门的数量的线性减少,每个单激励和双激励分别为$2$和$8$的因子。我们的结果降低了量子分子模拟的近期实现的要求。

英文摘要:

Molecular quantum simulations with the variational quantum eigensolver (VQE) rely on ansatz states that approximate the molecular ground states. These ansatz states are generally defined by parametrized fermionic excitation operators and an initial reference state. Efficient ways to perform fermionic excitations are vital for the realization of the VQE on noisy intermediate-scale quantum computers. Here, we address this issue by first demonstrating circuits that perform qubit excitations, excitations that do not account for fermionic anticommutation relations. We then extend the functionality of these circuits to perform fermionic excitations. Compared to circuits constructed with the standard use of "$CNOT$ staircases", our circuits offer a linear reduction in the number of $CNOT$ gates, by a factor of $2$ and $8$ per single and double excitation, respectively. Our results reduce the requirements for near-term realizations of quantum molecular simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑