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 language | English (US) |
|---|---|
| Article number | 012006 |
| Journal | Journal of Physics: Conference Series |
| Volume | 84 |
| Issue number | 1 |
| DOIs | |
| State | Published - Oct 1 2007 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
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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 journal › Article
}
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 -