Limitation of entanglement due to spatial qubit separation

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dc.creatorDoll, Roland
dc.creatorWubs, Martijn
dc.creatorHanggi, Peter
dc.creatorKohler, Sigmund
dc.date2006-08-24
dc.date2006-09-27
dc.date.accessioned2026-07-07T07:19:47Z
dc.date.available2026-07-07T07:19:47Z
dc.descriptionWe consider spatially separated qubits coupled to a thermal bosonic field that causes pure dephasing. Our focus is on the entanglement of two Bell states which for vanishing separation are known as robust and fragile entangled states. The reduced two-qubit dynamics is solved exactly and explicitly. Our results allow us to gain information about the robustness of two-qubit decoherence-free subspaces with respect to physical parameters such as temperature, qubit-bath coupling strength and spatial separation of the qubits. Moreover, we clarify the relation between single-qubit coherence and two-qubit entanglement and identify parameter regimes in which the terms robust and fragile are no longer appropriate.
dc.description7 pages, 3 figures; revised version, accepted for publication in Europhys. Lett
dc.identifierhttps://arxiv.org/abs/cond-mat/0608526
dc.identifierhttp://arxiv.org/abs/cond-mat/0608526
dc.identifierEurophys. Lett. 76, 547 (2006)
dc.identifierdoi:10.1209/epl/i2006-10326-y
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/114758
dc.subjectMesoscale and Nanoscale Physics
dc.subjectQuantum Physics
dc.titleLimitation of entanglement due to spatial qubit separation
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