Search by tag «Physical Review Letters» 16 results
Scientists from ITMO’s School of Physics and Engineering have predicted that topological states that occur in a two-dimensional array of superconducting qubits make the system robust to disorders. This may allow scientists to make certain algorithms of quantum computing resilient to defects in the structure, which opens up new opportunities for the design of superconducting quantum processors.
ITMO Physicists Prove Feasibility of Non-Radiating States in Compact Acoustic Resonators: New Discovery Will Benefit Development of Acoustic Antennas and Sensors
Researchers from ITMO University’s Faculty of Physics have succeeded in disproving a non-existence theorem which states that oscillations in open resonance systems must fade out by radiating energy into the surrounding medium. The physicists were able to calculate the shapes of acoustic resonators for which this theorem would not apply. In the resulting system, the energy of oscillations does not radiate into the surrounding space and remains within the resonator. Results of this research will facilitate the development of acoustic antennas and sensors.
The proposed structure allows to generate electromagnetic fields without dissipating any energy into the surrounding environment. This type of electromagnetic source will pave the way for technological breakthroughs, such as highly efficient wireless power transfer systems, high-precision sensors, and RFID technology.
The scientists called it the anomalous exciton Hall effect. It occurs when a laser affects a semiconductor plate in the presence of a magnetic field. This phenomenon can be potentially used for studying exciton quasiparticles. The research is published in Physical Review Letters.
ITMO Scientists Propose Systems With Unique Interaction Between Photons and Mechanical Motion of Atoms
The researchers managed to demonstrate that such systems possess the features of non-typical phase transitions, nonstandard symmetry, and its spontaneous breaking in a strong optomechanical interaction regime. This invention may potentially help scientists develop memory chips for future quantum computers.
The results of this research can be used to control the properties of light and matter and to create quantum memory.
Authors of a paper on social relations’ modelling have adapted the popular model of human interaction in a society by adding individual preferences. According to the initial theory, human relations may reach a “paradise state” at some point. However, the new model contradicts this idea.
Two ITMO University physicists – PhD student Valerii Kozin and ITMO Fellow Oleksandr Kyriienko – have described genuine time crystals in an article in Physical Review Letters. These structures’ existence was first suggested by Frank Wilczek, laureate of the 2004 Nobel Prize in Physics, but other studies have asserted the impossibility of creating environments in which these crystals would exist. ITMO.NEWS spoke to Valerii Kozin to find out what time crystals really are, how the two scientists were able to prove the existence of a system in which they would exist, and what Einstein has got to do with it.
A research team from ITMO University and the Australian National University has discovered that different metasurfaces exhibit the same behavior provided a symmetry breaking is introduced to their unit cells (“meta-atoms”). Asymmetry of meta-atoms results in high-quality (high Q) resonances in the transmittance spectra of metasurfaces. Such resonances are capable of multiple amplification of external signals. By manipulating the asymmetry, scientists were able to control the resonances and thus a metasurface’s optical response, which is highly desirable for practical applications. The results of this research were published in Physical Review Letters.
An international research team has found a way to make frequency conversion of light at the nanoscale a hundred times more efficient. The new method is based on isolated dielectric nanoparticles supporting the so-called bound states in the continuum. Such states appear when radiating fields in the particle suppress each other, so that the electromagnetic energy inside the particle can be trapped. This prediction can be employed for a new generation of tiny frequency conversion devices, nanolasers. The research was published in Physical Review Letters on July 19, 2018 as a cover story.