Implementation of positive-operator-value measurements for single spin qubit via Heisenberg model  

作　　者：程留永 邵晓强 张寿 Yeon Kyu-Hwangc 

机构地区：[1]Department of Physics,College of Science,Yanbian University [2]Center for the Condensed-Matter Science and Technology,Department of Physics,Harbin Institute of Technology [3]BK21 Program Physics&Department of Physics,College of Natural Science,Chungbuk National University

出　　处：《Chinese Physics B》2010年第9期140-144,共5页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No.60667001)

摘　　要：This paper shows that a proposal for implementing all possible two-operator positive-operator-value measurements of single spin qubit can be obtained via introducing another spin qubit as ancilla. The realization process is accomplished from the free evolution of the Heisenberg XX model by considering nearest-neighbour spin interaction. A controlled- NOT gate, which is a significant operator for this scheme is also constructed and the generalisation to multiple-operator is considered finally.This paper shows that a proposal for implementing all possible two-operator positive-operator-value measurements of single spin qubit can be obtained via introducing another spin qubit as ancilla. The realization process is accomplished from the free evolution of the Heisenberg XX model by considering nearest-neighbour spin interaction. A controlled- NOT gate, which is a significant operator for this scheme is also constructed and the generalisation to multiple-operator is considered finally.

关 键 词：positive-operator-value measurements single spin qubit Heisenberg model 

分 类 号：O413.1[理学—理论物理]