Multiqubit entanglement witness

作者:Chen Lin*; Chen Yi Xin
来源:Physical Review A, 2007, 76(2): 022330.
DOI:10.1103/PhysRevA.76.022330

摘要

We introduce a feasible method of constructing the entanglement witness that detects genuine multiqubit entanglement in the vicinity of a given pure multiqubit state. We illustrate our method in the scenario of constructing the witnesses for the multiqubit states that are most often investigated theoretically and experimentally. It is shown that our method can construct the effective witnesses for experiments. We also investigate the entanglement detection of symmetric states and mixed states.