Entanglement amplification in a nondegenerate three-level cascade laser

Tesfa, Sintayehu

doi:10.1103/physreva.74.043816

Cited by 116 publications

(175 citation statements)

References 21 publications

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“…These studies are usually confined to the steady state case [1,31] or numerical solution for selected parameters [3,15]. However, in this article, upon using the rate of dephasing and deviation of the phase fluctuation as a probe, the evolution of the entanglement is studied when Ω = 0.…”

Section: A When There Is No External Driving Radiationmentioning

confidence: 99%

“…For nondegenerate three-level cascade laser, based on the assumption that there is no interaction among injected atoms, the photon number correlation is found to have the form [1] …”

Section: B Hillery-zubairy Criteriamentioning

confidence: 99%

“…The nonclassical features of the radiation are predominantely attributed to the atomic coherence induced by initially preparing the atoms in a coherent superposition of the energy levels between which a direct spontaneous transition is electric dipole forbidden [1,2] or by pumping the same with an external radiation [3][4][5][6]. However, due to the fragility of the coherent superposition, the pertinent continuous variable entanglement is believed to be significantly ruined by various phenomena closely associated with the lasing process; noteworthy among many are dephasing and phase fluctuations.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, a nondegenerate three-level laser has attracted a great deal of interest in relation to its potential as a reliable source of robust entangled light [1][2][3][4][5][6]. The nonclassical features of the radiation are predominantely attributed to the atomic coherence induced by initially preparing the atoms in a coherent superposition of the energy levels between which a direct spontaneous transition is electric dipole forbidden [1,2] or by pumping the same with an external radiation [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…However, in this article, the dynamics of the cavity radiation is analyzed following a straightforward analytic procedure recently outlined elsewhere [1,8,9,13]. The resulting analytical solutions were successfully employed earlier in the study of the time evolution of the two-mode squeezing and intensity [9].…”

Section: Introductionmentioning

confidence: 99%

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Effect of phase fluctuation and dephasing on the dynamics of entanglement generation in a correlated emission laser

Tesfa

2012

Optics Communications

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A detailed study of the effects of phase fluctuation and dephasing on the dynamics of the entanglement generated from a coherently pumped correlated emission laser is presented. It is found that the time evolution of the entanglement is significantly reliant on the phase fluctuation and dephasing, particularly, at early stages of the lasing process. In the absence of external driving radiation, the degree of entanglement and intensity turns out to attain a maximum value just before starting to exhibit oscillation which dies at longer time scale. However, in case the driving mechanism is on, the oscillatory nature disappears due to the additional induced coherent superposition and the degree of entanglement would be larger at steady state. Moreover, the degree of entanglement as predicted by the logarithmic negativity and the Duan-Giedke-Cirac-Zoller criteria exhibits a similar nature when there is no driving radiation, although such a trend is eroded with increasing strength of the pumping radiation at longer time scale. The other important aspect of the phase fluctuation and dephasing is the possibility of relaxing the time at which the maximum entanglement is detected.

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Section: A When There Is No External Driving Radiationmentioning

confidence: 99%

“…For nondegenerate three-level cascade laser, based on the assumption that there is no interaction among injected atoms, the photon number correlation is found to have the form [1] …”

Section: B Hillery-zubairy Criteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of phase fluctuation and dephasing on the dynamics of entanglement generation in a correlated emission laser

Tesfa

2012

Optics Communications

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Unidirectional Gaussian One‐Way Steering

Qars

2022

Annalen der Physik

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Steering is a type of quantum nonlocality that exhibits an inherent asymmetry between two observers. In a nondegenerate three‐level laser coupled to a two‐mode squeezed vacuum reservoir, under realistic experimental conditions, the Gaussian steering of two laser modes, A$\mathcal {A}$ and B$\mathcal {B}$, generated within the cascade transitions, respectively are examined. It is found that the scriptA→scriptB$\mathcal {A}\rightarrow \mathcal {B}$ steerability is always higher than that from scriptB→scriptA$\mathcal {B}\rightarrow \mathcal {A}$; in addition, the steering asymmetry cannot exceed ln 2, which implies that the state trueϱ̂scriptAB$\hat{\varrho }_{\mathcal {AB}}$ never diverges to an extremal asymmetry state. It is shown how squeezed noise can play a constructive role in realizing one‐way steering. As the main result, it is demonstrated that the state trueϱ̂scriptAB$\hat{\varrho }_{\mathcal {AB}}$ can exhibit one‐way steering solely from scriptA→scriptB$\mathcal {A}\rightarrow \mathcal {B}$, which is shown to emerge as a consequence of the fact that the intensity difference of the modes A$\mathcal {A}$ and B$\mathcal {B}$ is verified to remain always positive, irrespective of the physical and environmental parameters of trueϱ̂scriptAB$\hat{\varrho }_{\mathcal {AB}}$. The generated unidirectional one‐way steering may provide a useful resource for the distribution of the trust in future asymmetric quantum information tasks.

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Introduction

Tesfa¹

2020

Quantum Optical Processes

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Entanglement amplification in a nondegenerate three-level cascade laser

Cited by 116 publications

References 21 publications

Effect of phase fluctuation and dephasing on the dynamics of entanglement generation in a correlated emission laser

Effect of phase fluctuation and dephasing on the dynamics of entanglement generation in a correlated emission laser

Unidirectional Gaussian One‐Way Steering

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