### 抜粋

The authors use the formalism of thermo field dynamics and the classical Cramer's theorem to show that if two quantum systems are prepared independently and their centre of mass is found to be a thermal squeezed state, then both systems were prepared in thermal squeezed states. This constitutes an alternative derivation of the quantum version of Cramer's theorem. Further, they consider the case of two systems that are prepared independently and their centre of mass is in a pure state in the expanded space of thermo field dynamics. In this case it is shown that the system is also separable in the centre of mass and relative coordinates, and again all the states involved are thermal squeezed states.

元の言語 | English |
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記事番号 | 016 |

ページ（範囲） | 4527-4533 |

ページ数 | 7 |

ジャーナル | Journal of Physics A: Mathematical and General |

巻 | 24 |

発行部数 | 19 |

DOI | |

出版物ステータス | Published - 1991 12 1 |

外部発表 | Yes |

### ASJC Scopus subject areas

- Statistical and Nonlinear Physics
- Mathematical Physics
- Physics and Astronomy(all)

## フィンガープリント On classical properties of thermal squeezed states' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

## これを引用

*Journal of Physics A: Mathematical and General*,

*24*(19), 4527-4533. [016]. https://doi.org/10.1088/0305-4470/24/19/016