IDEAS home Printed from https://ideas.repec.org/a/nat/nature/v421y2003i6921d10.1038_nature01358.html
   My bibliography  Save this article

Experimental extraction of an entangled photon pair from two identically decohered pairs

Author

Listed:
  • Takashi Yamamoto

    (The Graduate University for Advanced Studies (SOKENDAI)
    CREST Interacting Carrier Electronics Project)

  • Masato Koashi

    (The Graduate University for Advanced Studies (SOKENDAI)
    CREST Interacting Carrier Electronics Project)

  • Şahin Kaya Özdemir

    (The Graduate University for Advanced Studies (SOKENDAI)
    CREST Interacting Carrier Electronics Project)

  • Nobuyuki Imoto

    (The Graduate University for Advanced Studies (SOKENDAI)
    CREST Interacting Carrier Electronics Project
    NTT Basic Research Laboratories, NTT Corporation)

Abstract

Entanglement is considered to be one of the most important resources in quantum information processing schemes, including teleportation1,2,3, dense coding4 and entanglement-based quantum key distribution5. Because entanglement cannot be generated by classical communication between distant parties, distribution of entangled particles between them is necessary. During the distribution process, entanglement between the particles is degraded by the decoherence and dissipation processes that result from unavoidable coupling with the environment. Entanglement distillation and concentration schemes6,7,8,9 are therefore needed to extract pairs with a higher degree of entanglement from these less-entangled pairs; this is accomplished using local operations and classical communication. Here we report an experimental demonstration of extraction of a polarization-entangled photon pair from two decohered photon pairs. Two polarization-entangled photon pairs are generated by spontaneous parametric down-conversion and then distributed through a channel that induces identical phase fluctuations to both pairs; this ensures that no entanglement is available as long as each pair is manipulated individually. Then, through collective local operations and classical communication we extract from the two decohered pairs a photon pair that is observed to be polarization-entangled.

Suggested Citation

  • Takashi Yamamoto & Masato Koashi & Şahin Kaya Özdemir & Nobuyuki Imoto, 2003. "Experimental extraction of an entangled photon pair from two identically decohered pairs," Nature, Nature, vol. 421(6921), pages 343-346, January.
  • Handle: RePEc:nat:nature:v:421:y:2003:i:6921:d:10.1038_nature01358
    DOI: 10.1038/nature01358
    as

    Download full text from publisher

    File URL: https://www.nature.com/articles/nature01358
    File Function: Abstract
    Download Restriction: Access to the full text of the articles in this series is restricted.

    File URL: https://libkey.io/10.1038/nature01358?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Zhang, Li-Hua & Yang, Ming & Cao, Zhuo-Liang, 2007. "Entanglement concentration for unknown W class states," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 374(2), pages 611-616.

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:nat:nature:v:421:y:2003:i:6921:d:10.1038_nature01358. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Sonal Shukla or Springer Nature Abstracting and Indexing (email available below). General contact details of provider: http://www.nature.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.