# Dynamical control of two-level system decay and long time freezing

Title | Dynamical control of two-level system decay and long time freezing |

Publication Type | Journal Article |

Year of Publication | 2009 |

Authors | Zhang WX, Zhuang J |

Journal Title | Physical Review A |

Volume | 79 |

Pages | 012310 |

Date Published | Jan |

ISBN Number | 1050-2947 |

Accession Number | ISI:000262979000045 |

Keywords | decoherence, matrix algebra, numerical analysis, phase modulation, quantum theory |

Abstract | We investigate with exact numerical calculation coherent control of a two-level quantum system's decay by subjecting the two-level system to many periodic ideal 2 pi phase modulation pulses. For three spectrum intensities (Gaussian, Lorentzian, and exponential), we find both suppression and acceleration of the decay of the two-level system, depending on difference between the spectrum peak position and the eigen frequency of the two-level system. Most interestingly, the decay of the two-level system freezes after many control pulses if the pulse delay is short. The decay freezing value is half of the decay in the first pulse delay. |

URL | <Go to ISI>://000262979000045 |

DOI | 10.1103/Physreva.79.012310 |