论文标题
变形：数值研究
Decoherence: A Numerical Study
论文作者
论文摘要
我们在由相对论量子场理论组成的系统中进行数值研究，该系统耦合到一个本身与环境耦合的测量设备。测量装置和环境被视为量子，非偏见的颗粒。我们使用精确的对角线化解决了该三方系统的波函数的Schrödinger方程。尽管对希尔伯特空间规模的计算限制使我们无法探索设备和环境由真正宏观数量的自由度组成的政权，但我们仍然看到清晰的脱糖证据：在环境中追踪环境，密度矩阵并描述了系统的密度矩阵并迅速地朝着矩阵朝着iagongonal in diagonal in subspace inspepace oppace of diagonal instpace oppace oppace extspace oppace oppace oppace of pospace a iinterpace。
We study quantum decoherence numerically in a system consisting of a relativistic quantum field theory coupled to a measuring device that is itself coupled to an environment. The measuring device and environment are treated as quantum, non-relativistic particles. We solve the Schrödinger equation for the wave function of this tripartite system using exact diagonalization. Although computational limitations on the size of the Hilbert space prevent us from exploring the regime where the device and environment consist of a truly macroscopic number of degrees of freedom, we nevertheless see clear evidence of decoherence: after tracing out the environment, the density matrix describing the system and measuring device evolves quickly towards a matrix that is close to diagonal in a subspace of pointer states.
