### Abstract

We consider an N qubit system and show that in the symmetric subspace, S, a pure state is not globally entangled, iff it is a coherent state. It is also proven that in the orthogonal complement S_{⊥} all states are globally entangled.

Original language | English |
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Pages (from-to) | 3792-3795 |

Number of pages | 4 |

Journal | Physics Letters, Section A: General, Atomic and Solid State Physics |

Volume | 372 |

Issue number | 21 |

DOIs | |

Publication status | Published - May 19 2008 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

**Coherent states and global entanglement in an N qubit system.** / Dömötör, Piroska; Benedict, Mihály G.

Research output: Contribution to journal › Article

*Physics Letters, Section A: General, Atomic and Solid State Physics*, vol. 372, no. 21, pp. 3792-3795. https://doi.org/10.1016/j.physleta.2008.03.006

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TY - JOUR

T1 - Coherent states and global entanglement in an N qubit system

AU - Dömötör, Piroska

AU - Benedict, Mihály G.

PY - 2008/5/19

Y1 - 2008/5/19

N2 - We consider an N qubit system and show that in the symmetric subspace, S, a pure state is not globally entangled, iff it is a coherent state. It is also proven that in the orthogonal complement S⊥ all states are globally entangled.

AB - We consider an N qubit system and show that in the symmetric subspace, S, a pure state is not globally entangled, iff it is a coherent state. It is also proven that in the orthogonal complement S⊥ all states are globally entangled.

UR - http://www.scopus.com/inward/record.url?scp=42749087391&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=42749087391&partnerID=8YFLogxK

U2 - 10.1016/j.physleta.2008.03.006

DO - 10.1016/j.physleta.2008.03.006

M3 - Article

AN - SCOPUS:42749087391

VL - 372

SP - 3792

EP - 3795

JO - Physics Letters, Section A: General, Atomic and Solid State Physics

JF - Physics Letters, Section A: General, Atomic and Solid State Physics

SN - 0375-9601

IS - 21

ER -