Entanglement via tunable Fano-type interference in asymmetric semiconductor quantum wells

Hao, Xiangying; Lv, Xin-You; Si, Liu-Gang; Yang, Xinling

doi:10.1016/j.physleta.2009.08.032

Cited by 5 publications

(3 citation statements)

References 55 publications

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“…Specifically, the RC presents a symmetric line-shape, and the TC an asymmetric one. This behavior clearly indicates that in the transmission and reflection spectra different kind of resonances appear, namely Breit-Wigner [39] and Fano [40], respectively which have a strong connection into into the building up of quantum correlations, as noted elsewhere [23,41,42]. The first ones, exhibiting symmetric Lorentzian peaks, stem from the coupling of a quasi bound state to the scattering states of the leads, while the second ones, characterized by asymmetric lineshapes, are present when two competing scattering mechanisms, a resonant one and a nonresonant one, interfere, and are due to electron-electron correlation [22,23].…”

Section: It Is a Bell State The Tcs Andsupporting

confidence: 59%

On demand entanglement in double quantum dots via coherent carrier scattering

2011

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We show how two qubits encoded in the orbital states of two quantum dots can be entangled or disentangled in a controlled way through their interaction with a weak electron current. The transmission/reflection spectrum of each scattered electron, acting as an entanglement mediator between the dots, shows a signature of the dot-dot entangled state. Strikingly, while few scattered carriers produce decoherence of the whole two-dots system, a larger number of electrons injected from one lead with proper energy is able to recover its quantum coherence. Our numerical simulations are based on a real-space solution of the three-particle Schrödinger equation with open boundaries. The computed transmission amplitudes are inserted in the analytical expression of the system density matrix in order to evaluate the entanglement.

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Section: It Is a Bell State The Tcs Andsupporting

confidence: 59%

On demand entanglement in double quantum dots via coherent carrier scattering

2011

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“…It was shown that gain without population inversion (GWI), EIT and enhancement in refractive index can be obtained for dephasing rate at room temperature. Several other studies have been carried out afterwards, on optical properties of SQWs and SQWs and based on quantum coherence and interference effect [36][37][38][39][40][41] . For example, Li et al 37 investigated the optical bistability and multistability in unidirectional ring cavity with SQWs.…”

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confidence: 99%

Tunneling induced two-dimensional phase grating in a quantum well nanostructure via third and fifth orders of susceptibility

Vafafard

Sahrai

Hamedi

et al. 2020

Sci Rep

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We study the nonlinear optical properties in an asymmetric double AlGaAs/GaAs quantum well nanostructure by using an external control field and resonant tunneling effects. It is found that the resonant tunneling can modulate the third-order and fifth-order of susceptibilities via detuning frequency of coupling light. In presence of the resonant tunneling and when the coupling light is in resonance with the corresponding transition, the real parts of third-order and fifth-order susceptibilities are enhanced which are accompanied by nonlinear absorption. However, in off-resonance of coupling light, real parts of third-order and fifth-order susceptibilities enhance while the nonlinear absorption vanishes. We investigate also the two-dimensional electromagnetically induced grating (2D-EIG) of the weak probe light by modulating the third-order and fifth-order susceptibilities. In resonance of coupling light, both amplitude and phase grating are formed in the medium due to enhancement of third-order and fifth-order probe absorption and dispersion. When the coupling light is out of resonance, most of probe energy is transferred from zero-order to higher-order directions due to resonant tunneling effect. The efficiency of phase grating for third-order of susceptibility is higher than phase grating for fifthorder susceptibility. Our proposed model may be useful for optical switching and optical sensors based on semiconductor nanostructures.

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“…Over the past two or three decades, nonlinear quantum optical phenomena based on quantum coherence and interference have been studied theoretically and experimentally in different coherent media [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. These phenomena, due to their potential application in quantum information technologies and all-optical sensors, have been realized in semiconductor nanostructures and solid state media due to their discrete energy levels and strong dipole moment [20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Polarized control of Goos–Hänchen shifts in four-level quantized graphene nanostructures

et al. 2016

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In this paper, we discuss Goos-Hänchen (GH) shifts of both reflected and transmitted light beams through a cavity containing single-layer graphene nanostructures. The Landau levels of a single layer graphene medium under a strong magnetic field can interact with infrared and terahertz signal radiation. Therefore, the GH shifts in both reflected and transmitted light beams can be obtained in the infrared and terahertz regions of radiation. We have realized that by controlling some adjustable parameters of the system, such as frequency detuning of applied fields, the Rabi frequency of a coupling field and the polarization of coupling light, the GH shifts can be manipulated in the infrared and terahertz regions. Moreover, the thickness of the intracavity medium is also considered as an important parameter on the behavior of GH shifts spectra.

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Entanglement via tunable Fano-type interference in asymmetric semiconductor quantum wells

Cited by 5 publications

References 55 publications

On demand entanglement in double quantum dots via coherent carrier scattering

On demand entanglement in double quantum dots via coherent carrier scattering

Tunneling induced two-dimensional phase grating in a quantum well nanostructure via third and fifth orders of susceptibility

Polarized control of Goos–Hänchen shifts in four-level quantized graphene nanostructures

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