Avoiding entanglement sudden-death via measurement feedback control in a quantum network

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dc.creatorYamamoto, Naoki
dc.creatorNurdin, Hendra I.
dc.creatorJames, Matthew R.
dc.creatorPetersen, Ian R.
dc.date2008-06-29
dc.date2008-11-27
dc.date.accessioned2026-07-07T12:04:42Z
dc.date.available2026-07-07T12:04:42Z
dc.descriptionIn this paper, we consider a linear quantum network composed of two distantly separated cavities that are connected via a one-way optical field. When one of the cavity is damped and the other is undamped, the overall cavity state obtains a large amount of entanglement in its quadratures. This entanglement however immediately decays and vanishes in a finite time. That is, entanglement sudden-death occurs. We show that the direct measurement feedback method proposed by Wiseman can avoid this entanglement sudden-death, and further, enhance the entanglement. It is also shown that the entangled state under feedback control is robust against signal loss in a realistic detector, indicating the reliability of the proposed direct feedback method in practical situations.
dc.description11 pages
dc.identifierhttps://arxiv.org/abs/0806.4754
dc.identifierhttp://arxiv.org/abs/0806.4754
dc.identifierPhysical Review A 78, 042339 (2008)
dc.identifierdoi:10.1103/PhysRevA.78.042339
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/208179
dc.subjectQuantum Physics
dc.titleAvoiding entanglement sudden-death via measurement feedback control in a quantum network
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