Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Laser Physics

Electrical and optical control of optical gain in a coupled triple quantum dot system operating in telecommunication window

Mohammad Reza Mehmannavaz, Hamed Sattari

Published Oct 7, 2014• 9 citations
Publisher

Abstract

We investigate the light amplification and gain without inversion (GWI) in triple quantum dot molecules in both steady-state and transient state. We demonstrate that the light amplification and GWI of a light pulse can be controlled through the rates of the incoherent pumping and tunneling between electronic levels. The required switching times for switching of a light pulse from absorption to gain and vice versa is then discussed. We obtain switching time at about 40 ps, which resembles a high-speed optical switch in nanostructure. The proposed approach in QDMs may provide some new possibilities for technological applications in optoelectronics and solid-state quantum information science.

DOI
10.1088/1054-660x/24/12/125201

Related papers

Optically controllable switch for light propagation based on triple coupled quantum dots

Mostafa Sahrai, Mohammad Reza Mehmannavaz, Hamed Sattari

A switch is proposed for controlling the subluminal and superluminal light propagation through the triple coupled quantum dots system. The steady-state and transient behavior of the absorption and the dispersion of a probe pulse through a triple quantum dots molecule are investigated. We demonstrate that the group velocity of a light pulse can be controlled from subluminal to superluminal or vice versa by controlling the rates of incoherent pumping and tunneling between electronic levels. Switching time is calculated by discussing the dependency of optical transient properties on the incoherent pumping and inter-dot tunneling rates. We introduce three controlling parameters that make it possible to control the wave propagation electrically or even optically in such coupled quantum dot systems.

Applied Optics•Apr 3, 2014•40 citations

Propagation of a laser pulse and electro-optic switch in a GaAs/AlGaAs quadruple-coupled quantum dot molecule nanostructure

Jalil Shiri

Abstract Based on a GaAs/AlGaAs quadruple-coupled quantum dot heterostructure, an optical switch for controlling superluminal and subluminal light propagation is suggested. The transient and steady state behaviour of the absorption and dispersion of a probe pulse laser field through a quadruple quantum dot molecule are studied. We show that the group velocity of a light pulse can be controlled from superluminal to subluminal, or vice versa, by controlling the tunnelling rates between the quantum dots. The required switching time is calculated and we find it to be about 8 ps. We also investigated a method for the all-optical switching of probe field absorption from a large amount to nearly zero just by applying an incoherent pumping field. We estimated the required switching time for this case to be between 3 and 14 ps.

Laser Physics•Apr 13, 2016•8 citations

Electrical and optical control of entanglement entropy in a coupled triple quantum dot system

Mohammad Reza Mehmannavaz

We investigated theoretically the entanglement creation through tunneling rate and fields in a four-level triple quantum dot molecule based on InAs/GaAs/AlGaAs heterostructure in both steady state and transient state. We demonstrate that the entanglement entropy among the QDM and its spontaneous emission fields can be controlled by coherent and incoherent pumping field and tunnel-coupled electronics levels. The results may provide some new possibilities for technological applications in solid-state quantum information science, quantum computing, teleportation, encryption, compression codec, and optoelectronics.

Journal of Modern Optics•May 6, 2015•3 citations

Effect of an incoherent pumping field and tunnelling rate on optically controllable switching for light propagation in a InAs quadruple-coupled quantum dot molecule nanostructure

Mohammad Reza Ghorbani Fard, Olesya V. Vershinina, A. V. Katsaba

We propose using a nanostructure with quantum dots to switch light pulses between superluminal and subluminal propagation. Additionally, by adjusting tunneling rates and incoherent pumping field, the speed of light pulses can be controlled with a 5 ps switching time.

IEEE Photonics Conference•Nov 10, 2024•0 citations

Slow and fast light propagation and controllable switch at λ = 1.55 µ m in a photonic crystal with a defect layer doped by an InAs/GaAs quintuple-coupled quantum dot molecule nanostructure

Jalil Shiri

Abstract The transient and steady-state behavior of the probe absorption and dispersion at 1.55 µ m wavelength through a 1D photonic crystal with a defect layer doped by an InAs/GaAs quintuple quantum dot molecule nanostructure are discussed. We show that the group velocity of a light pulse can be controlled just by controlling the rate of incoherent pumping and interdot tunneling. We also investigate the electro-optical switching time of light propagation from subluminal to superluminal or vice versa. The time required to switch from subluminal to superluminal light propagation is found to be in the range 17–34 ps. Such controllable optical properties in a 1D photonic crystal with a defect layer may provide some new possibilities for technological applications in optoelectronics, solid-state quantum information science and systems dealing with signal processing.

Laser Physics•Mar 20, 2019•8 citations

A quintuple quantum dot system for electrical and optical control of multi/bistability in a telecommunication window

Mohammad Reza Mehmannavaz, Hamed Sattari

We propose a model for a quintuple coupled quantum dot system based on a GaAs/AlGaAs heterostructure. Then, we analyze the optical bistability (OB) and optical multistability (OM) behaviours and transition between the regimes at a wavelength of We take the benefit of consecutive and parallel interdot tunnelling and an incoherent pumping field for electrical and even optical control of the processes. It is shown that OB, OM and transition between them can be accomplished and controlled by adjusting the rate of the inter-dot tunnellings (electrical bias), probe wavelength detuning and rate of the optical incoherent pumping field. By proper choice of the controlling parameters, the bistable hysteresis loop becomes narrower, which makes it easier for the cavity field to reach saturation. We interpret the OB and OM behaviours by discussing the absorption of the active medium. We also investigate switching time between the two stable states when the output field jumps from a lower branch to an upper branch. Such a controllable OB/OM and transition between them in multiple QD molecules at a wavelength of 1.550 μ m, may provide some new possibilities for technological applications in optoelectronics, solid-state quantum information science and systems dealing with signal processing.

Laser Physics Letters•Jan 9, 2015•12 citations
We investigate the light amplification and gain without inversion (GWI) in triple quantum dot molecules in both steady-state and transient state. We demonstrate that the light amplification and GWI of a light pulse can be controlled through the rates of the incoherent pumping and tunneling between electronic levels. The required switching times for switching of a light pulse from absorption to gain and vice versa is then discussed. We obtain switching time at about 40 ps, which resembles a high-speed optical switch in nanostructure. The proposed approach in QDMs may provide some new possibilities for technological applications in optoelectronics and solid-state quantum information science.
A switch is proposed for controlling the subluminal and superluminal light propagation through the triple coupled quantum dots system. The steady-state and transient behavior of the absorption and the dispersion of a probe pulse through a triple quantum dots molecule are investigated. We demonstrate that the group velocity of a light pulse can be controlled from subluminal to superluminal or vice versa by controlling the rates of incoherent pumping and tunneling between electronic levels. Switching time is calculated by discussing the dependency of optical transient properties on the incoherent pumping and inter-dot tunneling rates. We introduce three controlling parameters that make it possible to control the wave propagation electrically or even optically in such coupled quantum dot systems.
Abstract Based on a GaAs/AlGaAs quadruple-coupled quantum dot heterostructure, an optical switch for controlling superluminal and subluminal light propagation is suggested. The transient and steady state behaviour of the absorption and dispersion of a probe pulse laser field through a quadruple quantum dot molecule are studied. We show that the group velocity of a light pulse can be controlled from superluminal to subluminal, or vice versa, by controlling the tunnelling rates between the quantum dots. The required switching time is calculated and we find it to be about 8 ps. We also investigated a method for the all-optical switching of probe field absorption from a large amount to nearly zero just by applying an incoherent pumping field. We estimated the required switching time for this case to be between 3 and 14 ps.
We investigated theoretically the entanglement creation through tunneling rate and fields in a four-level triple quantum dot molecule based on InAs/GaAs/AlGaAs heterostructure in both steady state and transient state. We demonstrate that the entanglement entropy among the QDM and its spontaneous emission fields can be controlled by coherent and incoherent pumping field and tunnel-coupled electronics levels. The results may provide some new possibilities for technological applications in solid-state quantum information science, quantum computing, teleportation, encryption, compression codec, and optoelectronics.
Abstract The transient and steady-state behavior of the probe absorption and dispersion at 1.55 µ m wavelength through a 1D photonic crystal with a defect layer doped by an InAs/GaAs quintuple quantum dot molecule nanostructure are discussed. We show that the group velocity of a light pulse can be controlled just by controlling the rate of incoherent pumping and interdot tunneling. We also investigate the electro-optical switching time of light propagation from subluminal to superluminal or vice versa. The time required to switch from subluminal to superluminal light propagation is found to be in the range 17–34 ps. Such controllable optical properties in a 1D photonic crystal with a defect layer may provide some new possibilities for technological applications in optoelectronics, solid-state quantum information science and systems dealing with signal processing.
We propose a model for a quintuple coupled quantum dot system based on a GaAs/AlGaAs heterostructure. Then, we analyze the optical bistability (OB) and optical multistability (OM) behaviours and transition between the regimes at a wavelength of We take the benefit of consecutive and parallel interdot tunnelling and an incoherent pumping field for electrical and even optical control of the processes. It is shown that OB, OM and transition between them can be accomplished and controlled by adjusting the rate of the inter-dot tunnellings (electrical bias), probe wavelength detuning and rate of the optical incoherent pumping field. By proper choice of the controlling parameters, the bistable hysteresis loop becomes narrower, which makes it easier for the cavity field to reach saturation. We interpret the OB and OM behaviours by discussing the absorption of the active medium. We also investigate switching time between the two stable states when the output field jumps from a lower branch to an upper branch. Such a controllable OB/OM and transition between them in multiple QD molecules at a wavelength of 1.550 μ m, may provide some new possibilities for technological applications in optoelectronics, solid-state quantum information science and systems dealing with signal processing.