论文标题
焦耳扩张期间硬核量子气的纠缠动力学
Entanglement dynamics of a hard-core quantum gas during a Joule expansion
论文作者
论文摘要
我们研究了一维硬核量子气的纠缠动态，该量子气体最初被限制在一个大小$ l $的盒子中，饱和密度$ρ= 1 $。通过移动一个盒子边缘，气体突然释放到了一个尺寸$ 2L $的区域。我们表明，即使气体对盒子边缘进行了几次反射，从量子波动流体动力学获得的纠缠熵的分析预测也是如此。我们进一步研究了长时间的限制$ t/l \ gg 1 $，其中出现了非平衡动力学的浮雕图片，并且流体动力学最终会崩溃。
We study the entanglement dynamics of a one-dimensional hard-core quantum gas initially confined in a box of size $L$ with saturated density $ρ=1$. The gas is suddenly released into a region of size $2L$ by moving one of the box edges. We show that the analytic prediction for the entanglement entropy obtained from quantum fluctuating hydrodynamics holds quantitatively true even after several reflections of the gas against the box edges. We further investigate the long time limit $t/L\gg 1$ where a Floquet picture of the non-equilibrium dynamics emerges and hydrodynamics eventually breaks down.
