### Abstract

We present two linear optical schemes using nonideal photodetectors to demonstrate the inseparability of W -type N -partite entangled states containing only a single photon. First, we show that the pairwise entanglement of arbitrary two modes chosen from N optical modes can be detected using the method proposed by Nha and Kim [Phys. Rev. A 74, 012317 (2006)], thereby suggesting a full inseparability among N parties. In particular, this scheme is found to succeed for any nonzero quantum efficiency of photodetectors. Second, we consider a quantum teleportation network using linear optics without auxiliary modes. The conditional teleportation can be optimized by a suitable choice of the transmittance of the beam splitter in the Bell measurement. Specifically, we identify the conditions under which maximum fidelity larger than the classical bound 2/3 is achieved only in cooperation with other parties. We also investigate the case of on-off photodetectors that cannot discriminate between the number of detected photons.

Original language | English |
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Article number | 012326 |

Journal | Physical Review A - Atomic, Molecular, and Optical Physics |

Volume | 75 |

Issue number | 1 |

DOIs | |

Publication status | Published - 2007 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics

### Cite this

**Demonstrating multipartite entanglement of single-particle W states : Linear optical schemes.** / Nha, Hyunchul; Kim, Jaewan.

Research output: Contribution to journal › Article

}

TY - JOUR

T1 - Demonstrating multipartite entanglement of single-particle W states

T2 - Linear optical schemes

AU - Nha, Hyunchul

AU - Kim, Jaewan

PY - 2007

Y1 - 2007

N2 - We present two linear optical schemes using nonideal photodetectors to demonstrate the inseparability of W -type N -partite entangled states containing only a single photon. First, we show that the pairwise entanglement of arbitrary two modes chosen from N optical modes can be detected using the method proposed by Nha and Kim [Phys. Rev. A 74, 012317 (2006)], thereby suggesting a full inseparability among N parties. In particular, this scheme is found to succeed for any nonzero quantum efficiency of photodetectors. Second, we consider a quantum teleportation network using linear optics without auxiliary modes. The conditional teleportation can be optimized by a suitable choice of the transmittance of the beam splitter in the Bell measurement. Specifically, we identify the conditions under which maximum fidelity larger than the classical bound 2/3 is achieved only in cooperation with other parties. We also investigate the case of on-off photodetectors that cannot discriminate between the number of detected photons.

AB - We present two linear optical schemes using nonideal photodetectors to demonstrate the inseparability of W -type N -partite entangled states containing only a single photon. First, we show that the pairwise entanglement of arbitrary two modes chosen from N optical modes can be detected using the method proposed by Nha and Kim [Phys. Rev. A 74, 012317 (2006)], thereby suggesting a full inseparability among N parties. In particular, this scheme is found to succeed for any nonzero quantum efficiency of photodetectors. Second, we consider a quantum teleportation network using linear optics without auxiliary modes. The conditional teleportation can be optimized by a suitable choice of the transmittance of the beam splitter in the Bell measurement. Specifically, we identify the conditions under which maximum fidelity larger than the classical bound 2/3 is achieved only in cooperation with other parties. We also investigate the case of on-off photodetectors that cannot discriminate between the number of detected photons.

UR - http://www.scopus.com/inward/record.url?scp=33846496634&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33846496634&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.75.012326

DO - 10.1103/PhysRevA.75.012326

M3 - Article

AN - SCOPUS:33846496634

VL - 75

JO - Physical Review A - Atomic, Molecular, and Optical Physics

JF - Physical Review A - Atomic, Molecular, and Optical Physics

SN - 1050-2947

IS - 1

M1 - 012326

ER -