An Elementary Optical Gate for Expanding Symmetrically Shared Entanglement

  • Toshiyuki Tashima
  • Şahin Kaya Özdemir
  • Takashi Yamamoto
  • Masato Koashi
  • Nobuyuki Imoto
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5106)

Abstract

We introduce an elementary optical gate based on post-selection strategy that enables not only to prepare polarization entangled W state, but also to grow this into a large-scale multi-photon W state. The gate is composed of a pair of 50:50 beamsplitters and a phase shifter, and it requires a two-photon ancillary state. When the input is a photon from an n-photon W state, the gate produces an (n + 2)-photon W state for post-selected events. Moreover, we show that this gate can be used to prepare and expand GHZ states by a simple modification of the ancillary state.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Toshiyuki Tashima
    • 1
    • 2
  • Şahin Kaya Özdemir
    • 1
    • 2
    • 3
  • Takashi Yamamoto
    • 1
    • 2
  • Masato Koashi
    • 1
    • 2
  • Nobuyuki Imoto
    • 1
    • 2
  1. 1.Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering ScienceOsaka University, ToyonakaOsakaJapan
  2. 2.CREST Photonic Quantum Information ProjectSaitamaJapan
  3. 3.ERATO Nuclear Spin Electronics ProjectSendaiJapan

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