Decoherence and entanglement of a linear chain of dipole coupled atoms

M. Benedict, P. Földi, Attila Czirják, Tamás Serényi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The time evolution of short linear chains consisting of dipole coupled two-level systems (atoms) is investigated under the influence of oscillator modes, which represent the environment. The dynamics of the system is calculated using the super-radiant master equation. The focus is on phenomena related to the environment induced decoherence and entanglement degradation. For large atomic distances the initially present pair entanglement is destroyed independently from the spatial position of the two atoms, while when the distance between the atoms becomes comparable to the resonant wavelength the rate of entanglement degradation corresponds to the strength of the pair interaction. Below one resonant wavelength of atomic separation, formation of pair entanglement is also possible in the initial stage of the time evolution. In this case it is found that pair entanglement is formed and destroyed periodically, and the strengths of the consecutive 'entanglement revivals' are damped depending on the initial state. The subradiant states, for which decoherence is slow, also preserve pair entanglements for an exceptionally long time.

Original languageEnglish
JournalJournal of Optics B: Quantum and Semiclassical Optics
Volume6
Issue number3
DOIs
Publication statusPublished - Mar 2004

Fingerprint

dipoles
degradation
atoms
wavelengths
oscillators
interactions

Keywords

  • Entanglement dynamics
  • Sub-radiant states
  • Super-radiant states

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy (miscellaneous)

Cite this

Decoherence and entanglement of a linear chain of dipole coupled atoms. / Benedict, M.; Földi, P.; Czirják, Attila; Serényi, Tamás.

In: Journal of Optics B: Quantum and Semiclassical Optics, Vol. 6, No. 3, 03.2004.

Research output: Contribution to journalArticle

@article{54d8c58848e44ab5af22769af81a9d28,
title = "Decoherence and entanglement of a linear chain of dipole coupled atoms",
abstract = "The time evolution of short linear chains consisting of dipole coupled two-level systems (atoms) is investigated under the influence of oscillator modes, which represent the environment. The dynamics of the system is calculated using the super-radiant master equation. The focus is on phenomena related to the environment induced decoherence and entanglement degradation. For large atomic distances the initially present pair entanglement is destroyed independently from the spatial position of the two atoms, while when the distance between the atoms becomes comparable to the resonant wavelength the rate of entanglement degradation corresponds to the strength of the pair interaction. Below one resonant wavelength of atomic separation, formation of pair entanglement is also possible in the initial stage of the time evolution. In this case it is found that pair entanglement is formed and destroyed periodically, and the strengths of the consecutive 'entanglement revivals' are damped depending on the initial state. The subradiant states, for which decoherence is slow, also preserve pair entanglements for an exceptionally long time.",
keywords = "Entanglement dynamics, Sub-radiant states, Super-radiant states",
author = "M. Benedict and P. F{\"o}ldi and Attila Czirj{\'a}k and Tam{\'a}s Ser{\'e}nyi",
year = "2004",
month = "3",
doi = "10.1088/1464-4266/6/3/001",
language = "English",
volume = "6",
journal = "Journal of Physics B: Atomic, Molecular and Optical Physics",
issn = "0953-4075",
publisher = "IOP Publishing Ltd.",
number = "3",

}

TY - JOUR

T1 - Decoherence and entanglement of a linear chain of dipole coupled atoms

AU - Benedict, M.

AU - Földi, P.

AU - Czirják, Attila

AU - Serényi, Tamás

PY - 2004/3

Y1 - 2004/3

N2 - The time evolution of short linear chains consisting of dipole coupled two-level systems (atoms) is investigated under the influence of oscillator modes, which represent the environment. The dynamics of the system is calculated using the super-radiant master equation. The focus is on phenomena related to the environment induced decoherence and entanglement degradation. For large atomic distances the initially present pair entanglement is destroyed independently from the spatial position of the two atoms, while when the distance between the atoms becomes comparable to the resonant wavelength the rate of entanglement degradation corresponds to the strength of the pair interaction. Below one resonant wavelength of atomic separation, formation of pair entanglement is also possible in the initial stage of the time evolution. In this case it is found that pair entanglement is formed and destroyed periodically, and the strengths of the consecutive 'entanglement revivals' are damped depending on the initial state. The subradiant states, for which decoherence is slow, also preserve pair entanglements for an exceptionally long time.

AB - The time evolution of short linear chains consisting of dipole coupled two-level systems (atoms) is investigated under the influence of oscillator modes, which represent the environment. The dynamics of the system is calculated using the super-radiant master equation. The focus is on phenomena related to the environment induced decoherence and entanglement degradation. For large atomic distances the initially present pair entanglement is destroyed independently from the spatial position of the two atoms, while when the distance between the atoms becomes comparable to the resonant wavelength the rate of entanglement degradation corresponds to the strength of the pair interaction. Below one resonant wavelength of atomic separation, formation of pair entanglement is also possible in the initial stage of the time evolution. In this case it is found that pair entanglement is formed and destroyed periodically, and the strengths of the consecutive 'entanglement revivals' are damped depending on the initial state. The subradiant states, for which decoherence is slow, also preserve pair entanglements for an exceptionally long time.

KW - Entanglement dynamics

KW - Sub-radiant states

KW - Super-radiant states

UR - http://www.scopus.com/inward/record.url?scp=1842424796&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=1842424796&partnerID=8YFLogxK

U2 - 10.1088/1464-4266/6/3/001

DO - 10.1088/1464-4266/6/3/001

M3 - Article

AN - SCOPUS:1842424796

VL - 6

JO - Journal of Physics B: Atomic, Molecular and Optical Physics

JF - Journal of Physics B: Atomic, Molecular and Optical Physics

SN - 0953-4075

IS - 3

ER -