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A two-level resolution neural network with enhanced interpretability for freeway traffic forecasting.
Sci Rep
December 2024
Department of Civil Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
Deep learning models are widely used for traffic forecasting on freeways due to their ability to learn complex temporal and spatial relationships. In particular, graph neural networks, which integrate graph theory into deep learning, have become popular for modeling traffic sensor networks. However, traditional graph convolutional networks (GCNs) face limitations in capturing long-range spatial correlations, which can hinder accurate long-term predictions.
View Article and Find Full Text PDFEntanglement Generation in Weakly Driven Arrays of Multilevel Atoms via Dipolar Interactions.
Phys Rev Lett
December 2024
JILA, NIST, Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.
We investigate the driven-dissipative dynamics of multilevel atomic arrays interacting via dipolar interactions at subwavelength spacings. Unlike two-level atoms in the weakly excited regime, multilevel atoms can become strongly entangled. The entanglement manifests as the growth of spin waves in the ground-state manifold and survives after turning off the drive.
View Article and Find Full Text PDFEnhancing Two-Photon Absorption of Green Fluorescent Protein by Quantum Entanglement.
J Phys Chem B
December 2024
Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.
Exploring the electronic states of molecules through excitation with entangled and classical photon pairs offers new insights into the nature of light-matter interactions and stimulates the development of quantum spectroscopy. Here, we address the importance of temporal entanglement of light in two-photon absorption (TPA) upon the S → S transition by the green fluorescent protein (GFP)─a key molecular unit in the bioimaging of living cells. By invoking a two-level model applicable when permanent dipole pathways dominate the two-photon transition, we derive a convenient closed-form analytical expression for the entangled TPA strength.
View Article and Find Full Text PDFContinuous Microwave Photon Counting by Semiconductor-Superconductor Hybrids.
Phys Rev Lett
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NanoLund and Solid State Physics, Lund University, Box 118, 22100 Lund, Sweden.
We present a continuous microwave photon counter based on superconducting cavity-coupled semiconductor quantum dots. The device utilizes photon-assisted tunneling in a double quantum dot with tunneling events being probed by a third dot. Our device detects both single and multiple-photon absorption events independently, thanks to the energy tunability of a two-level double-dot absorber.
View Article and Find Full Text PDFHybrid Source of Quantum Light for Generation of Frequency Tunable Fock States.
Phys Rev Lett
November 2024
Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller University Jena, Albert-Einstein-Straße 15, 07745 Jena, Germany.
We propose a scheme for quantum-light generation in a nonlinear cavity hybridized with a two-level system and theoretically show that, when excited by a series of controlled pump pulses, the hybrid source generates Fock states with high probabilities, e.g., one- and two-photon states can be generated near on demand, and Fock states with up to seven photons with a probability above 50%.
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