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Digital Feedback Loop in Paraxial Fluids of Light: A Gate to New Phenomena in Analog Physical Simulations.
Phys Rev Lett
December 2024
Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal and INESC TEC, Centre of Applied Photonics, Rua do Campo Alegre 687, 4169-007 Porto, Portugal.
Easily accessible through tabletop experiments, paraxial fluids of light are emerging as promising platforms for the simulation and exploration of quantumlike phenomena. In particular, the analogy builds on a formal equivalence between the governing model for a Bose-Einstein condensate under the mean-field approximation and the model of laser propagation inside nonlinear optical media under the paraxial approximation. Yet, the fact that the role of time is played by the propagation distance in the analog system imposes strong bounds on the range of accessible phenomena due to the limited length of the nonlinear medium.
View Article and Find Full Text PDFinvestigations on hydrodynamic phonon transport: From diffusion to convection.
Int J Heat Mass Transf
March 2024
Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095, United States of America.
In classical theory, heat conduction in solids is regarded as a diffusion process driven by a temperature gradient, whereas fluid transport is understood as convection process involving the bulk motion of the liquid or gas. In the framework of theory, which is directly built upon quantum mechanics without relying on measured parameters or phenomenological models, we observed and investigated the fluid-like convective transport of energy carriers in solid heat conduction. Thermal transport, carried by phonons, is simulated in graphite by solving the Boltzmann transport equation using a Monte Carlo algorithm.
View Article and Find Full Text PDFHybrid Boson Sampling.
Entropy (Basel)
October 2024
Department of Physics and Astronomy and Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843-4242, USA.
We propose boson sampling from a system of coupled photons and Bose-Einstein condensed atoms placed inside a multi-mode cavity as a simulation process testing the quantum advantage of quantum systems over classical computers. Consider a two-level atomic transition far-detuned from photon frequency. An atom-photon scattering and interatomic collisions provide interactions that create quasiparticles and excite atoms and photons into squeezed entangled states, orthogonal to the atomic condensate and classical field driving the two-level transition, respectively.
View Article and Find Full Text PDFHydrodynamic modulation instability triggered by a two-wave system.
Chaos
October 2024
Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan.
Article Synopsis
- Modulation instability (MI) causes regular nonlinear wave trains to break down, potentially resulting in localized phenomena like rogue waves across various nonlinear dispersive media, including hydrodynamics and optics.
- The classical MI dynamics can start with small-amplitude sidebands around a main wave peak, often visualized as a three-wave interaction setup in experiments, but more complex patterns can emerge through breather solutions of the nonlinear Schrödinger equation (NLSE).
- This study explores MI in deep-water surface gravity waves, demonstrating that it can be initiated by just a single unstable sideband, yielding experimental results that align closely with nonlinear simulations, while also indicating shifts in focusing cycle behavior observed in longer-term wave evolution.
What can we learn from the experiment of electrostatic conveyor belt for excitons?
J Phys Condens Matter
October 2024
Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, People's Republic of China.
Article Synopsis
- Scientists studied excitons, which are special particles made of an electron and a hole, to understand how they move and create patterns in experiments.
- They found that patterns close to the light source came from "hot" excitons acting like regular particles, while patterns farther away came from "cooled" excitons that behave differently.
- By using a complex equation, they modeled how these excitons move over time and found results that matched experiments, showing that how quickly excitons cool down is key to their movement.
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