Adjusting amplitude of the stored optical solitons by inter-dot tunneling coupling in triple quantum dot molecules

Wang, Yin; Si-jie, Zhou; Deng, Yonghe; Chen, Qiao

doi:10.1088/1674-1056/ac8f3d

Cited by 3 publications

(3 citation statements)

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“…These phenomena can be effectively harnessed for various practical applications. [35][36][37][38][39][40][41][42][43] We concentrate on achieving optimal and robust population transfer in an asymmetric double quantum-dot molecule (ADQDM). [44][45][46][47][48] The present system consists of two SQDs with distinct band structures connected through tunneling.…”

Section: Introductionmentioning

confidence: 99%

Optimal and robust control of population transfer in asymmetric quantum-dot molecules

Guo 郭,

Ma 马,

Shu 束

2024

Chinese Phys. B

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We present an optimal and robust quantum control method for efficient population transfer in asymmetric double quantum dot molecules. We derive a long-duration control scheme that allows for highly efficient population transfer by accurately controlling the amplitude of a narrow-bandwidth pulse. To overcome fluctuations in control field parameters, we employ a frequency-domain quantum optimal control theory method to optimize the spectral phase of a single pulse with broad bandwidth while preserving the spectral amplitude. We show that this spectral-phase-only optimization approach can successfully identify robust and optimal control fields, leading to efficient population transfer to the target state while concurrently suppressing population transfer to undesired states. The method demonstrates resilience to fluctuations in control field parameters, making it a promising approach for reliable and efficient population transfer in practical applications.

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Section: Introductionmentioning

confidence: 99%

Optimal and robust control of population transfer in asymmetric quantum-dot molecules

Guo 郭,

Ma 马,

Shu 束

2024

Chinese Phys. B

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“…In the field of nonlinear optics, researchers have shifted their attention to studying the propagation characteristics of individual optical solitons while also studying the transmission of multiple optical solitons in optical fibers and fiber lasers. [1][2][3][4][5][6][7] Research has shown that when there are two or more optical solitons in a fiber, they will interact with each other, attracting or repelling each other like particles. [8][9][10] Under certain initial conditions, complex interactions between optical solitons can lead to a series of interesting nonlinear phenomena.…”

Section: Introductionmentioning

confidence: 99%

Influence of the initial parameters on soliton interaction in nonlinear optical systems

Zhang

2023

Chinese Phys. B

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In nonlinear optical systems, optical solitons have the transmission properties of reducing error rate, improving system security and stability, and have important research significance in future research on all optical communication. This paper uses the bilinear method to obtain the two-soliton solutions of the nonlinear Schrödinger equation. By analyzing the relevant physical parameters in the obtained solutions, the interaction between optical solitons is optimized. The influence of initial conditions on the interactions of optical solitons are analyzed in detail, the reason why the interaction of optical solitons is sensitive to the initial condition is discussed, and the interactions of optical solitons are effectively weakened. The relevant results are beneficial for reducing the error rate and promoting the communication quality of the system.

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“…Michael等 [43] 发现点间TIT不仅可以抑制介质对光的吸收, 而且还可以调节光通过系统的传播速度. 让一束探测光通过量子点EIT介质去传播 [44,45] , 发现体系所形成的光孤子能够存储起来. 佘彦超等 [46] 发现通过调节TIT强度能使体系产生双透明窗口, 且系统所产生的时间孤子是亮孤子还是暗孤子完全由控制光强的强度来确定.…”

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Effect of inter-dot tunneling coupling on soliton dynamical behaviors in four-level triple quantum dot EIT medium

Wang,

Chen

et al. 2024

Acta Phys. Sin.

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Soliton, which can travel over long distance without attenuation and shape change due to the balance of the interplay between dispersion (or diffraction) and nonlinearity in nonlinear media, becomes a good information carrier in quantum information processing and transmission. Up to now, the study on the optical solitons mainly is focus on ultra-cold atomic electromagnetic induction transparency (EIT) media. This is mainly because ultra-cold atomic systems can generate strong nonlinear effects under low light excitation. However, for the practical application, it is a large challenge to control accurately the optical solitons dynamics in the atomic EIT media due to its low temperature (which approaches to absolute zero) and rarefaction. Fortunately, with the maturity of semiconductor quantum production technology, quantum dots have extensively applying prospect in quantum information processing and transmission. So, in the paper, we study the optical solitons dynamics in a four-level asymmetric array-type three quantum dots EIT medium.Based on the current experiment, we first propose a four-level asymmetric array-type three quantum dots EIT model. Subsequently, by using amplitude variable approach combined with multi-scale method, we study analytically the propagation of a probe pulses in this system. It is shown that when one (the another) inter-dot tunneling coupling is turned on (off), only a single transparency window appears in the center range of the probe field detuning. Only if two inter-dot tunneling couplings are turned on, two transparent windows are distributed on both sides of the central region of the probe field detuning. And the width of the single or two transparent window becomes wider with the increasing strength of the inter-dot tunneling coupling. For the nonlinear case, by choosing appropriate parameters in the area of the transparency window, the stable propagation of soliton can be realized. Interestingly, we find that the strength of the inter-dot tunneling coupling has an important effect on the soliton dynamics behaviors. In the case that one (the another) inter-dot tunneling coupling is turned on (off), with the increasing strength of the inter-dot tunneling coupling, the velocity of the soliton exhibits a trend of first increasing and then decreasing, as well as the amplitude of the soliton appears a increasing trend for ever. For the case that two inter-dot tunneling couplings are turned on, with the increasing strength of the two inter-dot tunneling coupling, the velocity of the soliton emerges a decreasing trend for ever, while the amplitude of the soliton presents a trend of first decreasing and then increasing. Thus, the amplitude modulation effect of optical soliton can be realized in semiconductor quantum dot devices.

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Adjusting amplitude of the stored optical solitons by inter-dot tunneling coupling in triple quantum dot molecules

Cited by 3 publications

References 50 publications

Optimal and robust control of population transfer in asymmetric quantum-dot molecules

Optimal and robust control of population transfer in asymmetric quantum-dot molecules

Influence of the initial parameters on soliton interaction in nonlinear optical systems

Effect of inter-dot tunneling coupling on soliton dynamical behaviors in four-level triple quantum dot EIT medium

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