### 抄録

Feedback control is expected to considerably protect quantum states against decoherence caused by interaction between the system and environment. Especially, Markovian feedback scheme developed by Wiseman can modify the properties of decoherence and eventually recover the purity of the steady state of the corresponding master equation. This paper provides a condition for which the modified master equation has a pure steady state. By applying this condition to a two-qubit system, we obtain a complete parametrization of the feedback Hamiltonian such that the steady state becomes a maximally entangled state.

元の言語 | English |
---|---|

記事番号 | 024104 |

ジャーナル | Physical Review A - Atomic, Molecular, and Optical Physics |

巻 | 72 |

発行部数 | 2 |

DOI | |

出版物ステータス | Published - 2005 8 |

外部発表 | Yes |

### Fingerprint

### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics
- Physics and Astronomy(all)

### これを引用

**Parametrization of the feedback Hamiltonian realizing a pure steady state.** / Yamamoto, Naoki.

研究成果: Article

}

TY - JOUR

T1 - Parametrization of the feedback Hamiltonian realizing a pure steady state

AU - Yamamoto, Naoki

PY - 2005/8

Y1 - 2005/8

N2 - Feedback control is expected to considerably protect quantum states against decoherence caused by interaction between the system and environment. Especially, Markovian feedback scheme developed by Wiseman can modify the properties of decoherence and eventually recover the purity of the steady state of the corresponding master equation. This paper provides a condition for which the modified master equation has a pure steady state. By applying this condition to a two-qubit system, we obtain a complete parametrization of the feedback Hamiltonian such that the steady state becomes a maximally entangled state.

AB - Feedback control is expected to considerably protect quantum states against decoherence caused by interaction between the system and environment. Especially, Markovian feedback scheme developed by Wiseman can modify the properties of decoherence and eventually recover the purity of the steady state of the corresponding master equation. This paper provides a condition for which the modified master equation has a pure steady state. By applying this condition to a two-qubit system, we obtain a complete parametrization of the feedback Hamiltonian such that the steady state becomes a maximally entangled state.

UR - http://www.scopus.com/inward/record.url?scp=27144464899&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=27144464899&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.72.024104

DO - 10.1103/PhysRevA.72.024104

M3 - Article

AN - SCOPUS:27144464899

VL - 72

JO - Physical Review A

JF - Physical Review A

SN - 2469-9926

IS - 2

M1 - 024104

ER -