论文标题
超快自旋动力学：通过量子信息措施补充理论分析
Ultrafast spin dynamics: complementing theoretical analyses by quantum-information measures
论文作者
论文摘要
超快自旋动力学的理论分析通常通过可观察到的方式解决并讨论模拟现象，而在量子信息理论中，人们经常利用量子状态的度量。在本文中，我们报告了超快旋转动力学模拟中量子信息测量的可能益处。对于由飞秒激光脉冲照明的CO/CU异质结构，我们讨论了量子信息测量值的一般行为，特别是希尔伯特空间中的距离和密度矩阵中混合度的距离。这些度量特别对激光脉冲和样品组成的极化变化敏感。此外，它们与磁化和激发电子的数量密切相关。
Theoretical analyses of ultrafast spin dynamics commonly address and discuss simulated phenomena by means of observables, whereas in quantum information theory one often utilizes measures of quantum states. In this Paper we report on possible benefits of quantum information measures in simulations of ultrafast spin dynamics. For Co/Cu heterostructures illuminated by femtosecond laser pulses, we discuss the general behaviour of quantum information measures, in particular distances in Hilbert space and degrees of mixing in the density matrix. The measures are in particular sensitive to variations of the polarization of a laser pulse and the sample composition. Moreover, they are closely related to magnetization and number of excited electrons.
