论文标题
从具有淬火动态的纠缠认证到互动费米子的多部分纠缠
From entanglement certification with quench dynamics to multipartite entanglement of interacting fermions
论文作者
论文摘要
多部分纠缠（例如通过量子Fisher信息（QFI）见证）是量子技术的关键资源，但其实验认证极具挑战性。在这里，我们提出了一个实验友好的协议来测量QFI。它依赖于在热状态下淬灭后，可记录简单可观察物的短时动态，用于旋转，玻色子和费米子，并可以在标准的冷原子实验和其他对汉密尔顿系统的时间控制的平台中实现。为了展示该协议，我们为一维费米 - 哈伯德模型进行了仿真。此外，我们建立了一个将QFI与费米子系统多部分模式纠缠相连的界限家族，该模式可以在相当大的温度下检测多部分纠缠。我们的工作铺平了一种实验访问纠缠量子增强计量学的方法。
Multipartite entanglement, such as witnessed through the quantum Fisher information (QFI), is a crucial resource for quantum technologies, but its experimental certification is highly challenging. Here, we propose an experimentally friendly protocol to measure the QFI. It relies on recording the short-time dynamics of simple observables after a quench from a thermal state, works for spins, bosons, and fermions, and can be implemented in standard cold-atom experiments and other platforms with temporal control over the system Hamiltonian. To showcase the protocol, we simulate it for the one-dimensional Fermi--Hubbard model. Further, we establish a family of bounds connecting the QFI to multipartite mode entanglement for fermionic systems, which enable the detection of multipartite entanglement at sizable temperatures. Our work paves a way to experimentally accessing entanglement for quantum enhanced metrology.
