标题： 叠加态和纠缠态中的负能 显示英文标题

标题： Negative Energy in Superposition and Entangled States

摘要： 我们研究了可以在无质量标量场的各种量子态中达到的最大负能密度。 我们考虑了其中一到两个模被激发的状态，并表明能量密度可以用少量参数来表示。 我们计算了一模叠加态和两模纠缠态的几个例子中的这些参数，并找到了这些态中负能密度的最大幅值。 我们考虑了几种在量子光学实验中已生成或将生成的态。 显示英文摘要

摘要： We examine the maximum negative energy density which can be attained in various quantum states of a massless scalar field. We consider states in which either one or two modes are excited, and show that the energy density can be given in terms of a small number of parameters. We calculate these parameters for several examples of superposition states for one mode, and entangled states for two modes, and find the maximum magnitude of the negative energy density in these states. We consider several states which have been, or potentially will be, generated in quantum optics experiments.