论文标题
参考状态误差缓解：一种高精度化学量子计算的策略
Reference-State Error Mitigation: A Strategy for High Accuracy Quantum Computation of Chemistry
论文作者
论文摘要
破坏性和门误差严重限制了最先进的量子计算机的功能。这项工作介绍了一种量子化学的参考状态误差（REM）的策略，该量子可以直接在当前和近期设备上实施。 REM可以与现有的缓解程序一起应用，同时需要最少的后处理，并且只有一个或没有其他测量值。该方法对基础量子机械ansatz不可知，并且是针对变异量子eigensolver（VQE）设计的。在超导量子硬件上证明了小分子（H2，HEH+和LIH）基态能量（H2，HEH+和LIH）的计算准确性的两种魔术顺序提高。使用深度超过1000个两倍大门的嘈杂电路的仿真来争辩该方法的可扩展性。
Decoherence and gate errors severely limit the capabilities of state-of-the-art quantum computers. This work introduces a strategy for reference-state error mitigation (REM) of quantum chemistry that can be straightforwardly implemented on current and near-term devices. REM can be applied alongside existing mitigation procedures, while requiring minimal post-processing and only one or no additional measurements. The approach is agnostic to the underlying quantum mechanical ansatz and is designed for the variational quantum eigensolver (VQE). Two orders-of-magnitude improvement in the computational accuracy of ground state energies of small molecules (H2, HeH+ and LiH) is demonstrated on superconducting quantum hardware. Simulations of noisy circuits with a depth exceeding 1000 two-qubit gates are used to argue for scalability of the method.
