### Abstract

Lingua originale | English |
---|---|

pagine (da-a) | 2393-2404 |

Numero di pagine | 12 |

Rivista | Quantum Information Processing |

Volume | 15 |

Stato di pubblicazione | Published - 2016 |

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### All Science Journal Classification (ASJC) codes

- Electronic, Optical and Magnetic Materials
- Statistical and Nonlinear Physics
- Theoretical Computer Science
- Signal Processing
- Modelling and Simulation
- Electrical and Electronic Engineering

### Cita questo

**Nonlocality threshold for entanglement under general dephasing evolutions: A case study.** / Lo Franco, Rosario.

Risultato della ricerca: Article

*Quantum Information Processing*, vol. 15, pagg. 2393-2404.

}

TY - JOUR

T1 - Nonlocality threshold for entanglement under general dephasing evolutions: A case study

AU - Lo Franco, Rosario

PY - 2016

Y1 - 2016

N2 - Determining relationships between different types of quantum correlations in open composite quantum systems is important since it enables the exploitation of a type by knowing the amount of another type. We here review, by giving a formal demonstration, a closed formula of the Bell function, witnessing nonlocality, as a function of the concurrence, quantifying entanglement, valid for a system of two noninteracting qubits initially prepared in extended Werner-like states undergoing any local pure-dephasing evolution. This formula allows for finding nonlocality thresholds for the concurrence depending only on the purity of the initial state. We then utilize these thresholds in a paradigmatic system where the two qubits are locally affected by a quantum environment with an Ohmic class spectrum. We show that steady entanglement can be achieved and provide the lower bound of initial state purity such that this stationary entanglement is above the nonlocality threshold thus guaranteeing the maintenance of nonlocal correlations.

AB - Determining relationships between different types of quantum correlations in open composite quantum systems is important since it enables the exploitation of a type by knowing the amount of another type. We here review, by giving a formal demonstration, a closed formula of the Bell function, witnessing nonlocality, as a function of the concurrence, quantifying entanglement, valid for a system of two noninteracting qubits initially prepared in extended Werner-like states undergoing any local pure-dephasing evolution. This formula allows for finding nonlocality thresholds for the concurrence depending only on the purity of the initial state. We then utilize these thresholds in a paradigmatic system where the two qubits are locally affected by a quantum environment with an Ohmic class spectrum. We show that steady entanglement can be achieved and provide the lower bound of initial state purity such that this stationary entanglement is above the nonlocality threshold thus guaranteeing the maintenance of nonlocal correlations.

UR - http://hdl.handle.net/10447/175752

UR - http://link.springer.com/article/10.1007/s11128-016-1290-3?wt_mc=internal.event.1.SEM.ArticleAuthorOnlineFirst

M3 - Article

VL - 15

SP - 2393

EP - 2404

JO - Quantum Information Processing

JF - Quantum Information Processing

SN - 1570-0755

ER -