Nonlinearity of quantum dot waveguide helps entangle photons

European physicists have studied in detail the interaction of single photons in a photonic crystal waveguide containing a quantum dot. They showed that by varying the duration of the pulses and their delay, it is possible to achieve varying degrees of nonlinearity, as well as control the degree of correlation of light quanta. The study… Continue reading Nonlinearity of quantum dot waveguide helps entangle photons

Metasurfaces emit entangled photons with variable wavelengths

American and German physicists have fabricated thin metasurfaces consisting of arrays of silicon nanocavities that exhibit spontaneous parametric scattering. They showed that such structures are capable of generating entangled photons. Unlike traditional media used for this, metasurfaces have greater flexibility, which allows the wavelength of the resulting photons to be changed by changing the pump… Continue reading Metasurfaces emit entangled photons with variable wavelengths

Superfluorescence on single nanoparticles was obtained at room temperature

American physicists were able to induce anti-Stokes superfluorescence of one or several lanthanide-doped nanoparticles at room temperature. The rate of collective emission of ions turned out to be four orders of magnitude greater than ordinary luminescence. This research opens the way to the use of single nanoparticles in the creation of optical processors. The study… Continue reading Superfluorescence on single nanoparticles was obtained at room temperature

Physicists made photons interfere with magnons

Chinese physicists have demonstrated quantum interference between waves of different natures, namely between photons and magnons. They repeated the Hong-Wu-Mandel experiment, where dark polaritons excited in an atomic cloud acted as a beam splitter. By controlling the properties of polaritons using an additional laser, scientists could change the nature of the interference from bosonic to… Continue reading Physicists made photons interfere with magnons

One atom emits fourteen entangled photons

German physicists have reported the successful generation of entangled multiqubit states on photons using a single atom placed in a cavity. They managed to involve 12 photons in the creation of cluster states, and 14 photons of Greenberger-Horn-Zeilinger states. The frequency of generation and detection of entangled photonic chains based on the proposed scheme turned… Continue reading One atom emits fourteen entangled photons

Physicists saw Rabi oscillations using extreme ultraviolet light

European physicists have reported the observation of characteristic doublets in the spectra of electrons knocked out of helium atoms by coherent light in the extreme ultraviolet range. The result obtained indicates the occurrence of Rabi oscillations in atoms. The shape and position of the doublets could be theoretically reproduced only after taking into account the… Continue reading Physicists saw Rabi oscillations using extreme ultraviolet light

Quantum walks of atoms helped to search with the oracle

American physicists have experimentally realized quantum walks of neutral strontium-88 atoms in the cells of a two-dimensional optical lattice. The distribution and expansion of the atomic wave function in their work turned out to be in good agreement with the simple model up to a region of a hundred nodes. The scientists also demonstrated how… Continue reading Quantum walks of atoms helped to search with the oracle

Jupiter has limited the parameters of dark matter

Theoretical physicists have proposed a new method for constraining the parameters of dark matter based on data obtained by the orbiting Galileo spacecraft and the Juno station. The researchers calculated the flux of relativistic charged particles produced as a result of the annihilation of dark matter particles and compared the resulting theoretical value with the… Continue reading Jupiter has limited the parameters of dark matter

Physicists achieve sub-picosecond switching of Bose condensate at room temperature

Chinese physicists reported that they were able to switch the states of condensed exciton-polaritons at room temperature using light in a time not exceeding one picosecond. In the future, this result can be used in the development of optoelectronic devices operating at terahertz frequencies. The study was published in Physical Review Letters. Semiconductor electronics to… Continue reading Physicists achieve sub-picosecond switching of Bose condensate at room temperature

The Arab station Al Amal showed the ultraviolet glow of the Martian atmosphere

The Al Amal Mars station team presented an animation of the dynamics of the ultraviolet glow of the Martian atmosphere, covering one Earth year. An increase in the brightness of the glow occurs due to increased activity of the Sun and a reduction in the distance between it and Mars, reported on the mission's Twitter… Continue reading The Arab station Al Amal showed the ultraviolet glow of the Martian atmosphere