Dynamics of two-qubit entanglement in a self-interacting spin-bath

Francesca Fassioli Olsen, Alexandra Olaya-Castro, Neil F Johnson

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

It has recently been shown that interactions among the spins of a bath can result in an effective suppression of the decoherence of a single qubit embedded in a multi-spin environment. However, the effects of such intrabath interaction on the dynamics of entanglement are still not well understood. Here we study the dynamics of a system composed of two entangled qubits coupled to (1) independent self-interacting spin baths, and (2) a common self-interacting spin bath. We find that, as in the case of a single qubit, strong interactions among the spins in the bath may induce an effective decoupling between the bath and the system - this in turn suppresses the loss of entanglement that a non-, or weakly, interacting bath would typically cause. However we find that the intrabath interaction strength needed to achieve such effects is much larger than in the single qubit case, especially when the two qubits share the same environment. Our results illustrate the system's size effects in the entanglement sharing condition, where the entanglement within the bath limits the entanglement between the bath and the system.

Original languageEnglish (US)
Article number012006
JournalJournal of Physics: Conference Series
Volume84
Issue number1
DOIs
StatePublished - Oct 1 2007
Externally publishedYes

Fingerprint

baths
interactions
decoupling
retarding
causes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Dynamics of two-qubit entanglement in a self-interacting spin-bath. / Olsen, Francesca Fassioli; Olaya-Castro, Alexandra; Johnson, Neil F.

In: Journal of Physics: Conference Series, Vol. 84, No. 1, 012006, 01.10.2007.

Research output: Contribution to journalArticle

Olsen, Francesca Fassioli ; Olaya-Castro, Alexandra ; Johnson, Neil F. / Dynamics of two-qubit entanglement in a self-interacting spin-bath. In: Journal of Physics: Conference Series. 2007 ; Vol. 84, No. 1.
@article{e1403ac5291f4655b14a2483b53cfef3,
title = "Dynamics of two-qubit entanglement in a self-interacting spin-bath",
abstract = "It has recently been shown that interactions among the spins of a bath can result in an effective suppression of the decoherence of a single qubit embedded in a multi-spin environment. However, the effects of such intrabath interaction on the dynamics of entanglement are still not well understood. Here we study the dynamics of a system composed of two entangled qubits coupled to (1) independent self-interacting spin baths, and (2) a common self-interacting spin bath. We find that, as in the case of a single qubit, strong interactions among the spins in the bath may induce an effective decoupling between the bath and the system - this in turn suppresses the loss of entanglement that a non-, or weakly, interacting bath would typically cause. However we find that the intrabath interaction strength needed to achieve such effects is much larger than in the single qubit case, especially when the two qubits share the same environment. Our results illustrate the system's size effects in the entanglement sharing condition, where the entanglement within the bath limits the entanglement between the bath and the system.",
author = "Olsen, {Francesca Fassioli} and Alexandra Olaya-Castro and Johnson, {Neil F}",
year = "2007",
month = "10",
day = "1",
doi = "10.1088/1742-6596/84/1/012006",
language = "English (US)",
volume = "84",
journal = "Journal of Physics: Conference Series",
issn = "1742-6588",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Dynamics of two-qubit entanglement in a self-interacting spin-bath

AU - Olsen, Francesca Fassioli

AU - Olaya-Castro, Alexandra

AU - Johnson, Neil F

PY - 2007/10/1

Y1 - 2007/10/1

N2 - It has recently been shown that interactions among the spins of a bath can result in an effective suppression of the decoherence of a single qubit embedded in a multi-spin environment. However, the effects of such intrabath interaction on the dynamics of entanglement are still not well understood. Here we study the dynamics of a system composed of two entangled qubits coupled to (1) independent self-interacting spin baths, and (2) a common self-interacting spin bath. We find that, as in the case of a single qubit, strong interactions among the spins in the bath may induce an effective decoupling between the bath and the system - this in turn suppresses the loss of entanglement that a non-, or weakly, interacting bath would typically cause. However we find that the intrabath interaction strength needed to achieve such effects is much larger than in the single qubit case, especially when the two qubits share the same environment. Our results illustrate the system's size effects in the entanglement sharing condition, where the entanglement within the bath limits the entanglement between the bath and the system.

AB - It has recently been shown that interactions among the spins of a bath can result in an effective suppression of the decoherence of a single qubit embedded in a multi-spin environment. However, the effects of such intrabath interaction on the dynamics of entanglement are still not well understood. Here we study the dynamics of a system composed of two entangled qubits coupled to (1) independent self-interacting spin baths, and (2) a common self-interacting spin bath. We find that, as in the case of a single qubit, strong interactions among the spins in the bath may induce an effective decoupling between the bath and the system - this in turn suppresses the loss of entanglement that a non-, or weakly, interacting bath would typically cause. However we find that the intrabath interaction strength needed to achieve such effects is much larger than in the single qubit case, especially when the two qubits share the same environment. Our results illustrate the system's size effects in the entanglement sharing condition, where the entanglement within the bath limits the entanglement between the bath and the system.

UR - http://www.scopus.com/inward/record.url?scp=36448970555&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=36448970555&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/84/1/012006

DO - 10.1088/1742-6596/84/1/012006

M3 - Article

AN - SCOPUS:36448970555

VL - 84

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

IS - 1

M1 - 012006

ER -