The influence of spontaneously generated coherence on atom-photon entanglement in a Λ-type system with an incoherent pump

Yang, Xin; Yan, Dong; Bao, Qiyu; Zhang, Yan; Cui, Cui-Li

doi:10.2478/s11534-014-0520-5

Cited by 3 publications

(3 citation statements)

References 51 publications

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“…In this way, the control and manipulation of the decoherence can be exploited to enhance the entanglement between the system and its environment. It is proven that the entanglement of the induced steady state between a two-level atom and its spontaneous emission excitation is manipulated by detuning the intensity and relative phase of the fields [ 49 , 50 , 51 , 52 , 53 , 54 ]. It is worth noting that the hybrid entanglement between a photon and an atom has applications in quantum tools, such as quantum networks [ 55 ], quantum repeater [ 56 , 57 ], and so on.…”

Section: Introductionmentioning

confidence: 99%

Dephasing Process of a Single Atom Interacting with a Two-Mode Field

Khalil

Berrada

Abdel‐Khalek

et al. 2021

Entropy

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We consider the interaction of a qubit system with a two-mode field in the presence of multi-photon transition and phase damping effect. We use the master equation to obtain the density operator when the qubit is initially prepared in its excited state and the field is in a finite-dimensional pair coherent state. The properties of the considered system, such as the population inversion, amount of the mixedness, parameter estimation, and squeezing, are explored for one- and two-photon transitions. The effects of photon addition to the field and phase damping on the evaluation of these quantumness measures are also investigated.

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Section: Introductionmentioning

confidence: 99%

Dephasing Process of a Single Atom Interacting with a Two-Mode Field

Khalil

Berrada

Abdel‐Khalek

et al. 2021

Entropy

View full text Add to dashboard Cite

show abstract

“…In this way, manipulation and control of decoherence can lead to harnessing system-environment entanglement. It has been demonstrated that the induced steady state entanglement between an atom and its spontaneous emission excitation can be controlled by intensity, detuning and relative phase of applied fields [21][22][23][24][25][26]. It is noteworthy that hybrid atom-photon entanglement has found applications in new quantum tools such as quantum repeater [27,28], quantum networks and quantum memories [29].…”

Section: Introductionmentioning

confidence: 99%

Validating and controlling quantum enhancement against noise by the motion of a qubit

2020

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Experimental validation and control of quantum traits for an open quantum system are important for any quantum information purpose. We consider a traveling atom qubit as a quantum memory with adjustable velocity inside a leaky cavity, adopting a quantum witness as a figure of merit for quantumness assessment. We show that this model constitutes an inherent physical instance where the quantum witness does not work properly if not suitably optimized. We then supply the optimal intermediate blind measurements which make the quantum witness a faithful tester of quantum coherence. We thus find that larger velocities protect quantumness against noise, leading to lifetime extension of hybrid qubit-photon entanglement and to higher phase estimation precision. Control of qubit motion thus reveals itself as a quantum enhancer. arXiv:1911.07146v1 [quant-ph]

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“…Furthermore, in the context of semi-classical theory of atom-light interaction, it has been shown that the induced steady state entanglement between an atom and its spontaneous emission can be controlled by intensity and detuning parameter of an applied field [23]. It has, also, been demonstrated that the atom-photon entanglement depends on the relative phase of applied fields [24,25] and incoherent driving pump field [26].…”

Section: Introductionmentioning

confidence: 99%

Atom–photon, two-mode entanglement and two-mode squeezing in the presence of cross-Kerr nonlinearity

2015

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Abstract:The interaction of two quantized fields and three-level quantum system in a  -type configuration is investigated in the presence of cross-Kerr nonlinearity. We consider three models of coupling for the atom-photon interaction. First, we study the dynamical behavior of the atom-photon entanglement and show that increasing the cross-Kerr nonlinearity results in different behaviors in three considered models. Moreover, it is demonstrated that the two quantized modes can be entangled, on the other hand, by applying a classical driving field to the lower levels. Increasing the classical driving field destroys the long time atom-photon entanglement. Our results show that an oscillatory two-mode squeezing can be generated in the absence of a driving classical field and the cross-Kerr nonlinearity.

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The influence of spontaneously generated coherence on atom-photon entanglement in a Λ-type system with an incoherent pump

Cited by 3 publications

References 51 publications

Dephasing Process of a Single Atom Interacting with a Two-Mode Field

Dephasing Process of a Single Atom Interacting with a Two-Mode Field

Validating and controlling quantum enhancement against noise by the motion of a qubit

Atom–photon, two-mode entanglement and two-mode squeezing in the presence of cross-Kerr nonlinearity

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