Open AccessThe time evolution of relative density operator in phase diffusion channels
Author(s) -
Jun Zhou,
Hao Yuan,
Jian Song
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.030302
Subject(s) - operator (biology) , master equation , quantum entanglement , statistical physics , diffusion , coherence (philosophical gambling strategy) , state (computer science) , time evolution , representation (politics) , phase (matter) , diffusion process , fock space , physics , quantum mechanics , computer science , quantum , algorithm , biochemistry , chemistry , repressor , transcription factor , gene , knowledge management , innovation diffusion , politics , political science , law
By virtue of the properties of thermal entanglement, we succeed to obtain the solution to the representative phase diffusion master equation and give the operator sum representation of density operator. After analyzing the time evolution process of density operator at different initial state, we find out density operators keep invariable with the initial state being Fock state or thermal state. But the system always maintains coherence with phase diffusion when the initial state is coherent state.