Applied Physics B

, Volume 81, Issue 2–3, pp 151–153 | Cite as

Robust entanglement

  • H. Häffner
  • F. Schmidt-Kaler
  • W. Hänsel
  • C. F. Roos
  • T. Körber
  • M. Chwalla
  • M. Riebe
  • J. Benhelm
  • U. D. Rapol
  • C. Becher
  • R. Blatt
Rapid Communication

Abstract

It is common belief among physicists that entangled states of quantum systems lose their coherence rather quickly. The reason is that any interaction with the environment which distinguishes between the entangled sub-systems collapses the quantum state. Here we investigate entangled states of two trapped Ca+ ions and observe robust entanglement lasting for more than 20 s.

PACS

03.65 Ud 03.65 Yz 03.67 Mn 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • H. Häffner
    • 1
    • 2
  • F. Schmidt-Kaler
    • 1
    • 3
  • W. Hänsel
    • 1
  • C. F. Roos
    • 1
    • 2
  • T. Körber
    • 1
  • M. Chwalla
    • 1
  • M. Riebe
    • 1
  • J. Benhelm
    • 1
  • U. D. Rapol
    • 1
  • C. Becher
    • 1
    • 4
  • R. Blatt
    • 1
    • 2
  1. 1.Institut für ExperimentalphysikUniversität InnsbruckInnsbruckAustria
  2. 2.Institut für Quantenoptik und QuanteninformationÖsterreichische Akademie der WissenschaftenInnsbruckAustria
  3. 3.Abteilung Quanten-InformationsverarbeitungUniversität UlmUlmGermany
  4. 4.Fachrichtung Technische PhysikUniversität des SaarlandesSaarbrückenGermany

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