A new approach to obtaining positive-definite Wigner operator for two entangled particles with different masses

作者：范洪义; 徐学翔; 袁洪春; 王帅; 王震; 许朋; 姜年权

来源：Chinese Physics B, 2011, 51-55.

• positive-definite Wigner operator
• entangled form
• marginal distribution

Based on our previously proposed Wigner operator in entangled form,we introduce the generalized Wigner operator for two entangled particles with different masses,which is expected to be positive-definite.This approach is able to convert the generalized Wigner operator into a pure state so that the positivity can be ensured.The technique of integration within an ordered product of operators is used in the discussion.