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Nonlocal Activation of Bound Entanglement via Local Quantum Zeno Dynamics
Bound entanglement was shown to be activated [P. Horodecki et al., Phys. Rev. Lett. 82, 1056 (1999)] in the sense that the entanglement of a spatially separated two-qutrit system can be increased with nonzero probability via a sufficiently large number of preshared bound-entangled states, local thre...
Autores principales: | , , , |
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Lenguaje: | eng |
Publicado: |
2021
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1103/PhysRevA.105.022439 http://cds.cern.ch/record/2780994 |
_version_ | 1780971909881528320 |
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author | Ozaydin, Fatih Bayindir, Cihan Altintas, Azmi Ali Yesilyurt, Can |
author_facet | Ozaydin, Fatih Bayindir, Cihan Altintas, Azmi Ali Yesilyurt, Can |
author_sort | Ozaydin, Fatih |
collection | CERN |
description | Bound entanglement was shown to be activated [P. Horodecki et al., Phys. Rev. Lett. 82, 1056 (1999)] in the sense that the entanglement of a spatially separated two-qutrit system can be increased with nonzero probability via a sufficiently large number of preshared bound-entangled states, local three-level controlled operations, and classical communications. Here we present a local quantum Zeno scheme for activating bound entanglement which is based only on single-particle rotations and threshold measurements. In our scheme, neither a large number of bound-entangled states nor controlled operations are required, and classical communication is required only once at the end of the protocol. We show that a single bound-entangled state is sufficient for increasing the negativity of the target entangled state from 0.11 to 0.17, and by using four more bound-entangled states, negativity can be made greater than 0.42 and the fidelity to the maximally entangled state increases from 0.3 to 0.41, 0.50, 0.59, and 0.61. We believe our results are important not only for quantum technologies but also for a better understanding of quantum entanglement. |
id | cern-2780994 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2021 |
record_format | invenio |
spelling | cern-27809942022-03-08T03:10:23Zdoi:10.1103/PhysRevA.105.022439http://cds.cern.ch/record/2780994engOzaydin, FatihBayindir, CihanAltintas, Azmi AliYesilyurt, CanNonlocal Activation of Bound Entanglement via Local Quantum Zeno Dynamicsquant-phPhysics in GeneralBound entanglement was shown to be activated [P. Horodecki et al., Phys. Rev. Lett. 82, 1056 (1999)] in the sense that the entanglement of a spatially separated two-qutrit system can be increased with nonzero probability via a sufficiently large number of preshared bound-entangled states, local three-level controlled operations, and classical communications. Here we present a local quantum Zeno scheme for activating bound entanglement which is based only on single-particle rotations and threshold measurements. In our scheme, neither a large number of bound-entangled states nor controlled operations are required, and classical communication is required only once at the end of the protocol. We show that a single bound-entangled state is sufficient for increasing the negativity of the target entangled state from 0.11 to 0.17, and by using four more bound-entangled states, negativity can be made greater than 0.42 and the fidelity to the maximally entangled state increases from 0.3 to 0.41, 0.50, 0.59, and 0.61. We believe our results are important not only for quantum technologies but also for a better understanding of quantum entanglement.Bound entanglement was shown to be activated [P. Horodecki \textit{et al.,} Phys. Rev. Lett. \textbf{82,} 1056 (1999)] in the sense that the entanglement of a spatially separated two-qutrit system can be increased with nonzero probability via a sufficiently large number of preshared bound-entangled states, local three-level controlled operations, and classical communications. Here, we present a local quantum Zeno scheme for activating bound entanglement which is based only on single-particle rotations and threshold measurements. In our scheme, neither a large number of bound-entangled states nor controlled operations are required, and classical communication is required only once at the end of the protocol. We show that a single bound-entangled state is sufficient for increasing the negativity of the target entangled state from 0.11 to 0.17, and by using four more bound-entangled states, negativity can be made greater than 0.42 and the fidelity to the maximally entangled state increases from 0.3 to 0.41, 0.50, 0.59, and 0.61. We believe our results are important not only for quantum technologies but also for a better understanding of quantum entanglement.arXiv:2109.02214oai:cds.cern.ch:27809942021-09-06 |
spellingShingle | quant-ph Physics in General Ozaydin, Fatih Bayindir, Cihan Altintas, Azmi Ali Yesilyurt, Can Nonlocal Activation of Bound Entanglement via Local Quantum Zeno Dynamics |
title | Nonlocal Activation of Bound Entanglement via Local Quantum Zeno Dynamics |
title_full | Nonlocal Activation of Bound Entanglement via Local Quantum Zeno Dynamics |
title_fullStr | Nonlocal Activation of Bound Entanglement via Local Quantum Zeno Dynamics |
title_full_unstemmed | Nonlocal Activation of Bound Entanglement via Local Quantum Zeno Dynamics |
title_short | Nonlocal Activation of Bound Entanglement via Local Quantum Zeno Dynamics |
title_sort | nonlocal activation of bound entanglement via local quantum zeno dynamics |
topic | quant-ph Physics in General |
url | https://dx.doi.org/10.1103/PhysRevA.105.022439 http://cds.cern.ch/record/2780994 |
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