Entanglement degradation in a string of atoms coupled by the electromagnetic field

Péter Földi, Mihály G. Benedict, Tamás Serényi, Attila Czirják

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Abstract

We investigate the dynamics of short linear chains consisting of two-level systems (atoms) coupled by the electromagnetic field. The environment of photon modes acts as a source of noise and leads to the disappearance of the initially present multipartite entanglement. The rate of this process (entanglement degradation) depends on the separation of the atoms, and also on the initial state. With the aid of the appropriate entanglement witnesses we show that this rate is exceptionally low for the so-called subradiant states. Below one resonant wavelength of atomic separation the effect of the environmental noise is weaker than the dipole-dipole interaction and multipartite entanglement can be formed in the initial stage of the time evolution.

Original languageEnglish
Pages (from-to)L511-L519
JournalFluctuation and Noise Letters
Volume4
Issue number3
DOIs
Publication statusPublished - Sep 1 2004

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Keywords

  • Decoherence
  • Entanglement degradation
  • Master equation
  • Multipartite entanglement
  • Superradiance

ASJC Scopus subject areas

  • Mathematics(all)
  • Physics and Astronomy(all)

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