论文标题
通过准绝热回声检测到超阶的相关性作为揭示平衡量子相变的量子相干性的工具
Detecting out-of-time-order correlations via quasi-adiabatic echoes as a tool to reveal quantum coherence in equilibrium quantum phase transitions
论文作者
论文摘要
我们提出了一种新的动力学方法，以使用超阶相关性（OTOC）连接平衡量子相变和量子相干性。采用标志性的Lipkin-Meshkov-Glick和横向场模型作为说明性示例，我们表明，在多种量子相干性（MQC）强度的光谱中，可以观察到跨量子相变的基态的连贯性和纠缠的突然变化，这是一种特殊类型的OTOC。我们还开发了一种强大的方案，可以通过基态相图使用准绝热淬火获得相关的OTOC。我们的方案允许在没有时间逆转相干动态的情况下检测OTOC，这使得它适用于广泛的当前实验，在这些实验中，无法通过反转基础汉密尔顿的迹象来实现时间反转。
We propose a new dynamical method to connect equilibrium quantum phase transitions and quantum coherence using out-of-time-order correlations (OTOCs). Adopting the iconic Lipkin-Meshkov-Glick and transverse-field Ising models as illustrative examples, we show that an abrupt change in coherence and entanglement of the ground state across a quantum phase transition is observable in the spectrum of multiple quantum coherence (MQC) intensities, which are a special type of OTOC. We also develop a robust protocol to obtain the relevant OTOCs using quasi-adiabatic quenches through the ground state phase diagram. Our scheme allows for the detection of OTOCs without time-reversal of coherent dynamics, making it applicable and important for a broad range of current experiments where time-reversal cannot be achieved by inverting the sign of the underlying Hamiltonian.
