### Abstract

In this paper we consider the (state) reachability and controllability problems of special two-level quantum systems, the so-called quantum bits via externally applied electro-magnetic field. The system is described by special a bilinear right-invariant model whose state varies on the Lie group of 2 X 2 special unitary matrices. We show that if two or more independent controls are used, then every state can be achieved in arbitrary time using finite energy. The mathematical construction is motivated by the demand of manipulating (or logically operating on) the state of quantum bits, and the results provide some insight into the feasibility of realizing given operations in quantum computers.

Original language | English |
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Title of host publication | Towards Intelligent Engineering and Information Technology |

Editors | Imre Rudas, Janos Fodor, Janusz Kacprzyk |

Pages | 93-102 |

Number of pages | 10 |

DOIs | |

Publication status | Published - Dec 1 2009 |

### Publication series

Name | Studies in Computational Intelligence |
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Volume | 243 |

ISSN (Print) | 1860-949X |

### ASJC Scopus subject areas

- Artificial Intelligence

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## Cite this

*Towards Intelligent Engineering and Information Technology*(pp. 93-102). (Studies in Computational Intelligence; Vol. 243). https://doi.org/10.1007/978-3-642-03737-5_7