Demonstration of local expansion toward large-scale entangled webs

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

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


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 languageEnglish (US)
Article number210503
JournalPhysical review letters
Issue number21
StatePublished - Nov 17 2010

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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