The quantum information can be taken from the classical description of physics by Feynman path integrals. 通过费曼路径积分可以从物理学的经典描述中提取量子信息。
On the other hand, the path integral over metrics with nontrivial topologies leads to correlation functions that decay to zero. 这样随着时间推移只有保留在拓扑平凡路径积分上的完整物质信息将起作用。
