Possibility of Quantum Teleportation and the Reduced Density Matrix  

作　　者：ZHU Hong-Bo ZENG Jin-Yan 朱红波;曾谨言(Department of Physics,Peking University,Beijing 100871)

机构地区：[1]Department of Physics,Peking University,Beijing 100871

出　　处：《Chinese Physics Letters》2001年第7期860-863,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No.10047001.

摘　　要：It is shown that only the maximally entangled two-particle(spin 1/2)states whose one-particle reduced density matrix isρ(i)=(1/2)I2 can realize the teleportation of an arbitrary one-particle spin state.Based on this,to teleport an arbitrary k-particle spin state,one must prepare an N-particle entangled state whose k-particle(k<N)reduced density matrix has the structure 2-kI2k(I2k being the 2k x 2k identity matrix).The N-particle Greenberger-Horne-Zeilinger states cannot realize the teleportation of an arbitrary k-particle(N>k≥2)state,except for special states with only two components.

关 键 词：STATE MATRIX ARBITRARY 

分 类 号：O41[理学—理论物理]