Demonstration of local expansion toward large-scale entangled webs

Toshiyuki Tashima; Tsuyoshi Kitano; Şahin Kaya Özdemir; Takashi Yamamoto; Masato Koashi; Nobuyuki Imoto

doi:10.1103/PhysRevLett.105.210503

Demonstration of local expansion toward large-scale entangled webs

Toshiyuki Tashima, Tsuyoshi Kitano, Şahin Kaya Özdemir, Takashi Yamamoto, Masato Koashi, Nobuyuki Imoto

Engineering Science and Mechanics

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

We demonstrate an optical gate that increases the size of polarization-based W states by accessing only one of the qubits. Using this gate, we have generated three-photon and four-photon W states with fidelities 0.836±0.042 and 0.784±0.028, respectively. We also confirmed the existence of pairwise entanglement in every pair of qubits, including the one that was left untouched by the gate. The gate is applicable to any size of W states and hence is a universal tool for expanding entanglement.

Original language	English (US)
Article number	210503
Journal	Physical review letters
Volume	105
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.105.210503
State	Published - Nov 17 2010

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.105.210503

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AU - Özdemir, Şahin Kaya

AU - Yamamoto, Takashi

AU - Koashi, Masato

AU - Imoto, Nobuyuki

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Demonstration of local expansion toward large-scale entangled webs

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