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An Elementary Optical Gate for Expanding Symmetrically Shared Entanglement

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Book cover Theory of Quantum Computation, Communication, and Cryptography (TQC 2008)

Part of the book series: Lecture Notes in Computer Science ((LNTCS,volume 5106))

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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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Authors and Affiliations

  1. Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan

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

  2. CREST Photonic Quantum Information Project, 4-1-8 Honmachi, Kawaguchi, Saitama, 331-0012, Japan

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

  3. ERATO Nuclear Spin Electronics Project, Sendai, 980-8578, Japan

    Şahin Kaya Özdemir

Authors
  1. Toshiyuki Tashima
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  2. Şahin Kaya Özdemir
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  3. Takashi Yamamoto
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  4. Masato Koashi
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  5. Nobuyuki Imoto
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Editor information

Editors and Affiliations

  1. NTT Communication Science Laboratories, 3-1, Morinosato Wakamiya, Atsugi-shi, 243-0198, Kanagawa Pref., Japan

    Yasuhito Kawano

  2. Institute for Quantum Computing, University of Waterloo, N2L 3G1, Waterloo, ON, Canada

    Michele Mosca

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© 2008 Springer-Verlag Berlin Heidelberg

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Tashima, T., Özdemir, Ş.K., Yamamoto, T., Koashi, M., Imoto, N. (2008). An Elementary Optical Gate for Expanding Symmetrically Shared Entanglement. In: Kawano, Y., Mosca, M. (eds) Theory of Quantum Computation, Communication, and Cryptography. TQC 2008. Lecture Notes in Computer Science, vol 5106. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89304-2_7

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  • DOI: https://doi.org/10.1007/978-3-540-89304-2_7

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-89303-5

  • Online ISBN: 978-3-540-89304-2

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