论文标题
提案使用铃铛状态测量超时订购的相关性
Proposal to measure out-of-time-ordered correlations using Bell states
论文作者
论文摘要
我们提出了一项协议，以实验测量无限期的超级订购相关性（OTOC）（OTOC），该相关性是在系统中使用量子信息的探测器，用于具有手性对称性或粒子孔对称性的哈密顿量的系统。我们表明，可以通过准备两个纠缠系统，用哈密顿量进化并测量适当的局部可观察物来获得OTOC。以需要两份系统副本并对哈密顿量对称性进行限制，我们表明我们的方法比现有方法提供了一些优势 - 它可以在不逆转哈米尔顿人的迹象的情况下实施，它所需的测量量要少于基于SWAP操作员的计划，而不是实施SWAP操作员，并且它可以实现它的强大方法，并且该方法既可以毫无疑问，又需要进行一些廉价的方法。我们的想法可以在当前可用的量子平台中实现。
We present a protocol to experimentally measure the infinite-temperature out-of-time-ordered correlation (OTOC) -- which is a probe of quantum information scrambling in a system -- for systems with a Hamiltonian which has either a chiral symmetry or a particle-hole symmetry. We show that the OTOC can be obtained by preparing two entangled systems, evolving them with the Hamiltonian, and measuring appropriate local observables. At the cost of requiring two copies of the system and putting restrictions on the Hamiltonian's symmetries, we show that our method provides some advantages over existing methods -- it can be implemented without reversing the sign of the Hamiltonian, it requires fewer measurements than schemes based on implementing the SWAP operator, and it is robust to imperfections like some earlier methods. Our ideas can be implemented in currently available quantum platforms.
