Elben Andreas, Kueng Richard, Huang Hsin-Yuan Robert, van Bijnen Rick, Kokail Christian, Dalmonte Marcello, Calabrese Pasquale, Kraus Barbara, Preskill John, Zoller Peter, Vermersch Benoît
Center for Quantum Physics, University of Innsbruck, Innsbruck A-6020, Austria.
Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, Innsbruck A-6020, Austria.
Phys Rev Lett. 2020 Nov 13;125(20):200501. doi: 10.1103/PhysRevLett.125.200501.
We propose a method for detecting bipartite entanglement in a many-body mixed state based on estimating moments of the partially transposed density matrix. The estimates are obtained by performing local random measurements on the state, followed by postprocessing using the classical shadows framework. Our method can be applied to any quantum system with single-qubit control. We provide a detailed analysis of the required number of experimental runs, and demonstrate the protocol using existing experimental data [Brydges et al., Science 364, 260 (2019)SCIEAS0036-807510.1126/science.aau4963].
我们提出了一种基于估计部分转置密度矩阵的矩来检测多体混合态中二分纠缠的方法。通过对该态进行局部随机测量，然后使用经典影子框架进行后处理来获得估计值。我们的方法可应用于任何具有单量子比特控制的量子系统。我们对所需的实验运行次数进行了详细分析，并使用现有实验数据[Brydges等人，《科学》364, 260 (2019)SCIEAS0036 - 807510.1126 / science.aau4963]展示了该协议。
