论文标题
$ n $ point相关函数的稳健测量功能在数字量子计算机上
Robust measurements of $n$-point correlation functions of driven-dissipative quantum systems on a digital quantum computer
论文作者
论文摘要
我们提出并展示了一种统一的分层方法，用于测量可应用于驱动，耗散或以其他方式开放或非平衡量子系统的$ n $点相关函数。在这种方法中，通过通过受控操作与系统相互作用并立即测量Ancilla的时间演变反复中断。与其他基于Ancilla的干涉技术（例如Hadamard测试）相比，我们讨论了该方法的鲁棒性，并强调了其在开放量子系统的近期量子模拟方面的优势。我们在量子计算机上实现了该方法，以测量驱动性费米子系统的单粒子绿色功能。这项工作表明，可以使用近期量子计算机对驱动脱离系统的动力相关函数进行牢固测量。
We propose and demonstrate a unified hierarchical method to measure $n$-point correlation functions that can be applied to driven, dissipative, or otherwise open or non-equilibrium quantum systems. In this method, the time evolution of the system is repeatedly interrupted by interacting an ancilla qubit with the system through a controlled operation, and measuring the ancilla immediately afterwards. We discuss the robustness of this method as compared to other ancilla-based interferometric techniques (such as the Hadamard test), and highlight its advantages for near-term quantum simulations of open quantum systems. We implement the method on a quantum computer in order to measure single-particle Green's functions of a driven-dissipative fermionic system. This work shows that dynamical correlation functions for driven-dissipative systems can be robustly measured with near-term quantum computers.
