Quantum Chemistry Calculations on a Trapped-Ion Quantum Simulator
Quantum Chemistry Calculations on a Trapped-Ion Quantum Simulator
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DOI：
10.1103/physrevx.8.031022
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发表时间：
2018-07-24
影响因子：
12.5
通讯作者：
Roos, Christian F.
中科院分区：
文献类型：
--
作者：
Hempel, Cornelius;Maier, Christine;Roos, Christian F.
量子古典混合算法正在成为有前途的候选人，用于在从化学到物理和材料科学的各种领域中量子信息处理器的近期实际应用。我们使用基于捕获的离子的数字量子模拟器来报告这种算法的实验实施，以解决量子化学问题。具体而言，我们实现了变异量子本质量算法来计算两个简单分子的分子基态能量，并在实验上证明并比较了最多四个量子位的不同编码方法。此外，我们讨论了测量噪声以及缓解策略的影响，并指示了针对达到化学精确度的适应性实现的潜力，这可能是多Qualbit量子模拟器的跨平台基准。
Quantum-classical hybrid algorithms are emerging as promising candidates for near-term practical applications of quantum information processors in a wide variety of fields ranging from chemistry to physics and materials science. We report on the experimental implementation of such an algorithm to solve a quantum chemistry problem, using a digital quantum simulator based on trapped ions. Specifically, we implement the variational quantum eigensolver algorithm to calculate the molecular ground-state energies of two simple molecules and experimentally demonstrate and compare different encoding methods using up to four qubits. Furthermore, we discuss the impact of measurement noise as well as mitigation strategies and indicate the potential for adaptive implementations focused on reaching chemical accuracy, which may serve as a cross-platform benchmark for multiqubit quantum simulators.