dorsal/arxiv
View SchemaDemonstrating multipartite entanglement of single-particle W states: linear optical schemes
| Authors | Hyunchul Nha, Jaewan Kim |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0608055 |
| URL | https://arxiv.org/abs/quant-ph/0608055 |
| DOI | 10.1103/PhysRevA.75.012326 |
| Journal | Phys. Rev. A 75, 012326 (2007) |
Abstract
We present two linear optical schemes using nonideal photodetectors to demonstrate 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 the 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 classical bound 2/3 is achieved only in cooperation with other parties. We also investigate the case of on-off photodetectors that cannot discriminate the number of detected photons.
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"abstract": "We present two linear optical schemes using nonideal photodetectors to\ndemonstrate inseparability of W-type N-partite entangled states containing only\na single photon. First, we show that the pairwise entanglement of arbitrary two\nmodes chosen from N optical modes can be detected using the method proposed by\nNha and Kim [Phys. Rev. A 74, 012317 (2006)], thereby suggesting the full\ninseparability among N parties. In particular, this scheme is found to succeed\nfor any nonzero quantum efficiency of photodetectors. Second, we consider a\nquantum teleportation network using linear optics without auxiliary modes. The\nconditional teleportation can be optimized by a suitable choice of the\ntransmittance of the beam splitter in the Bell measurement. Specifically, we\nidentify the conditions under which maximum fidelity larger than classical\nbound 2/3 is achieved only in cooperation with other parties. We also\ninvestigate the case of on-off photodetectors that cannot discriminate the\nnumber of detected photons.",
"arxiv_id": "quant-ph/0608055",
"authors": [
"Hyunchul Nha",
"Jaewan Kim"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.75.012326",
"journal_ref": "Phys. Rev. A 75, 012326 (2007)",
"title": "Demonstrating multipartite entanglement of single-particle W states: linear optical schemes",
"url": "https://arxiv.org/abs/quant-ph/0608055"
},
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