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Scientific Reports

Spatial-dependent quantum dot-photon entanglement via tunneling effect

Yaser Delir ghaleh joughi, Mostafa Sahrai

Published May 14, 2022• 8 citations
Publisher

Abstract

Utilizing the vortex beams, we investigate the entanglement between the triple-quantum dot molecule and its spontaneous emission field. We present the spatially dependent quantum dot-photon entanglement created by Laguerre-Gaussian (LG) fields. The degree of position-dependent entanglement (DEM) is controlled by the angular momentum of the LG light and the quantum tunneling effect created by the gate voltage. Various spatial-dependent entanglement distribution is reached just by the magnitude and the sign of the orbital angular momentum (OAM) of the optical vortex beam.

DOI
10.1038/s41598-022-11810-8

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Utilizing the vortex beams, we investigate the entanglement between the triple-quantum dot molecule and its spontaneous emission field. We present the spatially dependent quantum dot-photon entanglement created by Laguerre-Gaussian (LG) fields. The degree of position-dependent entanglement (DEM) is controlled by the angular momentum of the LG light and the quantum tunneling effect created by the gate voltage. Various spatial-dependent entanglement distribution is reached just by the magnitude and the sign of the orbital angular momentum (OAM) of the optical vortex beam.
The atom-photon entanglement using the Laguerre-Gaussian (LG) beams is studied in the closed-loop three-level V-type quantum systems. We consider two schemes with near-degenerate and non-degenerate upper levels: in the first, the effect of the quantum interference due to the spontaneous emission is taken into account and in the second, a microwave plane wave is applied to the upper levels transition. It is shown that the atom-photon entanglement in both schemes depends on the intensity profile as well as the orbital angular momentum (OAM) of the applied fields so that the various spatially dependent entanglement patterns can be generated by Laguerre-Gaussian beams with different OAMs. However, due to the zero intensity,no entanglement appears in the center of the optical vortex beams. As a result, the entanglement between dressed atom and its spontaneous emissions in different points of the atomic vapor cell can be controlled by the OAM of the applied fields. Moreover, our numerical results show that the number of the local maximum degree of entanglement (DEM) peaks depends on the OAM of the applied fields. The degrees of freedom for OAM play a crucial role in spatially dependent atom-photon entanglement in such a way that it may possess broad applications in high-dimensional quantum information processing and data storage.
This study explores the influence of inter-dot tunneling effects within a quantum dot molecule on the Fresnel diffraction phenomenon. Our findings indicate that the Fresnel diffraction of the output probe Gaussian field can be manipulated by adjusting the inter-dot tunneling parameter's strength and the characteristics of the coupling field. The inter-dot tunneling effect establishes a closed-loop system, setting conditions for the interference of the applied fields. We specifically examine a Laguerre-Gaussian (LG) coupling field, investigating how its properties-such as strength, value, and sign of the orbital angular momentum (OAM)-impact the Fresnel diffraction of the output probe field. Increasing the inter-dot tunneling parameter and the coupling LG field's strength allows for control over the spatial distribution of the Fresnel diffraction pattern. Notably, the inter-dot tunneling parameter can disturb the symmetry of the diffraction patterns. Additionally, considering a negative OAM for the coupling LG field transforms the diffraction pattern into its inverse shape. This suggests that, in the presence of the inter-dot tunneling effect, the Fresnel diffraction pattern is contingent on the direction of rotation of the helical phase front of the coupling LG field. Our results offer insights into quantum control of Fresnel diffraction patterns and the identification of OAM in LG beams, presenting potential applications in quantum technologies.
We investigate the optical response of a closed-loop three-level quantum dot molecule driven by a structured Laguerre-Gaussian field carrying orbital angular momentum (OAM). Owing to the intrinsic phase sensitivity of the closed-loop configuration, the spatial phase structure of the coupling beam directly imprints on the probe-field dynamics, leading to a strongly spatially dependent optical response. As a result, phenomena such as Autler-Townes splitting, probe absorption, and amplification without inversion arise under both resonant and off-resonant conditions, with their spectral characteristics governed by the sign and magnitude of the OAM index. This OAM-controlled modulation of the optical response reveals a mechanism for phase-engineered light-matter interaction in quantum dot molecules. The results highlight the potential of this solid-state platform for structured light based quantum photonics, including quantum information processing, tunable slow and fast light, and high capacity optical data storage.
We investigate photon-photon entanglement via the Duan criterion within a three-level closed-loop system embedded in an ensemble of quantum dot molecules (QDMs). In this configuration, one of the interacting quantum modes is treated as a structured quantized field carrying a helical wavefront (Laguerre-Gaussian mode). We demonstrate that the resulting quantum entanglement exhibits a highly non-uniform spatial distribution across the transverse plane of the QDM ensemble. Due to the phase-sensitive nature of the closed-loop system, this spatial profile is strongly modulated by both the magnitude and sign of the orbital angular momentum (OAM) carried by the quantum mode. Our numerical results reveal that the entanglement pattern can be tailored from a uniform circular distribution into discrete multi-lobe structures. This precise spatial engineering of quantized photon entanglement opens up new avenues for high-dimensional quantum cryptography, spatially-multiplexed quantum communications, and the development of solid-state high-capacity quantum memories.
We investigate photon-photon entanglement via the Duan criterion within a three-level closed-loop system embedded in an ensemble of quantum dot molecules (QDMs). In this configuration, one of the interacting quantum modes is treated as a structured quantized field carrying a helical wavefront (Laguerre-Gaussian mode). We demonstrate that the resulting quantum entanglement exhibits a highly non-uniform spatial distribution across the transverse plane of the QDM ensemble. Due to the phase-sensitive nature of the closed-loop system, this spatial profile is strongly modulated by both the magnitude and sign of the orbital angular momentum (OAM) carried by the quantum mode. Our numerical results reveal that the entanglement pattern can be tailored from a uniform circular distribution into discrete multi-lobe structures. This precise spatial engineering of quantized photon entanglement opens up new avenues for high-dimensional quantum cryptography, spatially-multiplexed quantum communications, and the development of solid-state high-capacity quantum memories.
Abstract We propose a theoretical scheme for realizing a two-dimensional (2D) asymmetric diffraction grating in a four-level quantum dot molecules (QDMs) system with double tunneling effects. The QDMs system interacts with a weak probe field, a 2D SW control field and a composite Laguerre–Gaussian (LG) vortex field. By adjusting system parameters such as the orbital angular momentum (OAM) number, the beam waist parameter of the vortex light, the tunneling strength, and the detuning of the standing-wave (SW) field, the energy distribution and the diffraction intensity of the probe field can be controlled effectively. In addition, the detuning of the probe field can be used to achieve the symmetrical switching control of the 2D diffraction grating between the second and the fourth quadrants. This investigation may have potential application in beam splitting technology and optical device design.