I investigate quantum decoherence in a one-body density matrix of a composite particle consisting of two correlated particles. Because of the two-body correlation in the composite particle, quantum decoherence occurs in the one-body density matrix that has been reduced from the twobody density matrix. As the delocalization of the distribution of the composite particle grows, the entanglement en…

We calculate the von Neumann entanglement entropy and the Schmidt number of onedimensional (1D) cluster states and show that these are useful measures to estimate entanglement caused by delocalization of clusters. We analyze system size dependence of these entanglement measures in the linear-chain nα states given by Tohsaki–Horiuchi–Schuck–Röpke wave functions for 1D cluster gas st…

Tahun Terbit

2007