Local expansion of photonic W state using a polarization-dependent beamsplitter

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

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


We propose a simple probabilistic optical gate to expand polarization entangled W states. The gate uses one polarization-dependent beamsplitter and a horizontally polarized single photon as an ancilla. The gate post-selectively expands N-photon W states to (N+1)-photon W states. A feasibility analysis considering the realistic experimental conditions shows that the scheme is within the reach of the current quantum optical technologies.

Original languageEnglish (US)
Article number023024
JournalNew Journal of Physics
StatePublished - Feb 11 2009

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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