中等规模量子器件的跨平台验证
Cross-Platform Verification of Intermediate Scale Quantum Devices
摘要：
我们描述了一个跨平台验证量子模拟器和量子计算机的协议。我们展示了如何直接测量重叠的$\textrm{Tr}\left[ρ_1 ρ_2\right]$和纯度$\textrm{Tr}\left[ρ^2_{1,2}\right]$，从而在不同的实验平台上制备的两个可能的混合量子态$ρ_1$和$ρ_2$的保真度。我们只需要在随机的产品基础上进行局部测量，这是经典的。作为原理验证，我们在囚禁离子量子模拟器中测量了纠缠$10$ -量子比特量子态的实验-理论耦合度。
英文摘要：
We describe a protocol for cross-platform verification of quantum simulators and quantum computers. We show how to measure directly the overlap $\textrm{Tr}\left[ρ_1 ρ_2\right]$ and the purities $\textrm{Tr}\left[ρ^2_{1,2}\right]$, and thus a fidelity of two possibly mixed quantum states $ρ_1$ and $ρ_2$ prepared in separate experimental platforms. We require only local measurements in randomized product bases, which are communicated classically. As a proof-of-principle, we present the measurement of experiment-theory fidelities for entangled $10$-qubit quantum states in a trapped ion quantum simulator.
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