### Abstract

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

pagine (da-a) | 014004- |

Numero di pagine | 4 |

Rivista | Physica Scripta |

Volume | 2012 |

Stato di pubblicazione | Published - 2012 |

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### All Science Journal Classification (ASJC) codes

- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Mathematical Physics

### Cita questo

*Physica Scripta*,

*2012*, 014004-.

**Dynamics of correlations due to a phase noisy laser.** / Compagno, Giuseppe; Bellomo, Bruno; Lo Franco, Rosario; Cresser, James D; Andersson, Erika; Franco, Rosario Lo.

Risultato della ricerca: Article

*Physica Scripta*, vol. 2012, pagg. 014004-.

}

TY - JOUR

T1 - Dynamics of correlations due to a phase noisy laser

AU - Compagno, Giuseppe

AU - Bellomo, Bruno

AU - Lo Franco, Rosario

AU - Cresser, James D

AU - Andersson, Erika

AU - Franco, Rosario Lo

PY - 2012

Y1 - 2012

N2 - We analyze the dynamics of various kinds of correlations present between two initially entangled independent qubits, each one subject to a local phase-noisy laser. We give explicit expressions for the relevant quantifiers of correlations for the general case of single-qubit unital evolution, which includes the case of a phase-noisy laser. Although the light field is treated as classical, we find that this model can describe revivals of quantum correlations. Two different dynamical regimes of decay of correlations occur, a Markovian one (exponential decay) and a non-Markovian one (oscillatory decay with revivals) depending on the values of system parameters. In particular, in the non-Markovian regime, quantum correlations quantified by quantum discord show an oscillatory decay faster than that of classical correlations. Moreover, there are time regions where nonzero discord is present while entanglement is zero.

AB - We analyze the dynamics of various kinds of correlations present between two initially entangled independent qubits, each one subject to a local phase-noisy laser. We give explicit expressions for the relevant quantifiers of correlations for the general case of single-qubit unital evolution, which includes the case of a phase-noisy laser. Although the light field is treated as classical, we find that this model can describe revivals of quantum correlations. Two different dynamical regimes of decay of correlations occur, a Markovian one (exponential decay) and a non-Markovian one (oscillatory decay with revivals) depending on the values of system parameters. In particular, in the non-Markovian regime, quantum correlations quantified by quantum discord show an oscillatory decay faster than that of classical correlations. Moreover, there are time regions where nonzero discord is present while entanglement is zero.

KW - 03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.); 42.50.Dv Quantum state engineering and measurements; 03.67.Mn Entanglement measures, witnesses, and other characterizations; 02.50.Ga Markov processes

UR - http://hdl.handle.net/10447/66596

UR - http://iopscience.iop.org/1402-4896/2012/T147/014004;jsessionid=65093FB5A35F37097BD659311D1F2F09.c1

M3 - Article

VL - 2012

SP - 014004-

JO - Physica Scripta

JF - Physica Scripta

SN - 0031-8949

ER -