论文标题
评估具有强大相位估计的量子计算机上的能量差异
Evaluating energy differences on a quantum computer with robust phase estimation
论文作者
论文摘要
我们使用量子计算机将强大的相估计算法调整为两个特征态之间的能量差异的评估。这种方法不需要在辅助和系统寄存器之间甚至单个辅助量子器之间受控的单位。作为概念的证明，我们计算氢分子的基态和低洼电子激发的能量，在云量子计算机上最少。然后，我们的方法的代表鲁棒性是根据对状态准备和测量中相干误差的高容忍度进行量化的。从概念上讲，我们注意到所有量子相估计算法最终都评估了特征值差异。
We adapt the robust phase estimation algorithm to the evaluation of energy differences between two eigenstates using a quantum computer. This approach does not require controlled unitaries between auxiliary and system registers or even a single auxiliary qubit. As a proof of concept, we calculate the energies of the ground state and low-lying electronic excitations of a hydrogen molecule in a minimal basis on a cloud quantum computer. The denominative robustness of our approach is then quantified in terms of a high tolerance to coherent errors in the state preparation and measurement. Conceptually, we note that all quantum phase estimation algorithms ultimately evaluate eigenvalue differences.
