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exact sciences

optical network. Illustration: depositphotos.com

Hebrew University researchers have created the smallest color switch in the world

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The quick color switch allows an immediate change of the emitted color. The discovery has implications for diverse technologies in which fast color adjustment is required, such as display screens, quantum communication and miniaturized light sources
Crystal pump to generate quantum light for medical imaging devices. Photo courtesy of Shalom Schwartz

CAT scan for Schrödinger's cat

Quantum effects in X-rays make it possible to improve the resolution of the scan and protect the health of subjects and doctors
In the photo: a five-dimensional cube that Dr. Klein printed with a XNUMXD printer for his supervisor. Photo: Bar Ilan University Spokesperson

led to the solution of a 35-year-old mathematical problem

Meet Dr. Ohad Klein, PhD graduate in the Department of Mathematics at the Faculty of Exact Sciences, postdoctoral student at the Hebrew University and working at a startup company as an algorithmist
The enzymes of the start-up company break down the polyethylene terephthalate plastic into its monomers: terephthalic acid as well as ethylene glycol, which themselves can be used directly in existing plants to re-produce the polymer

Plastic recycling with the help of enzymes

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The French biotech start-up company called 'Carbios' succeeded in developing an enzymatic process to recycle the plastic polyethylene terephthalate (Polyethylene terephthalate) back to its component monomers, from which the finished polymer can be produced again
The white cells in the shrimp tail. Photo: Ben Gurion University

The shrimp redefines the laws of optics

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The shrimp has a particularly bright white color on its back and limbs that are intended to attract fish, which it 'cleanses' of pests it feeds on. An in-depth examination of the white substance using special electron microscopes revealed that the substance consists of an incredibly thin layer of very dense nanospheres (spheres of very tiny diameter)
Laser in a physics lab. Illustration: depositphotos.com

A new method of creating quantum light sources will help in encryption and solving security problems

Prof. Adi Aryeh: "We are standing at the threshold of a new technological world, and with it comes a host of new opportunities alongside a host of problems we have not yet encountered."
complex networks. Illustration: depositphotos.com

The ability to simply explain complex physical networks

Doctoral student Benia Gros from the Department of Physics, the President's Scholar, has so far published 15 articles and one book, and presented his works dealing with dependent physical networks, at 9 conferences
Higgs boson. Illustration: depositphotos.com

Physicists have developed tools to discover unknown interactions between elementary particles. Are we on the way to a new physics?

Prof. Yael Shadami from the Faculty of Physics at the Technion focuses on the study of elementary particles including electrons, quarks, photons and gluons, and the interactions, or forces, that act between them. It tries to discover more elementary particles and interactions, beyond those described in the "standard model" of particle physics
"Scale of Polarizations"

electronic skips

Researchers have built surfaces from layers of atoms that slide over each other, thus causing the electrons inside to skip. In the future, they hope that it will be possible to develop advanced information technologies based on them

Three free lectures in honor of World Quantum Day on May 10

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On May 10, three lectures in the field of quantum will be delivered to the general public, zoomed and free of charge. The event is being held in honor of World Quantum Day under the auspices of the Center for Quantum Information at the Hebrew University. No need to register in advance.

For the first time: the experiment of the two cracks in the timeline

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In an article published in the magazine Nature Physics, a team of researchers from Britain, the USA, Germany and Australia demonstrated for the first time the two cracks experiment in the timeline. Instead of spatial dispersion on a screen, the temporal crack created a dispersion in the light spectrum, and from the combination of another crack an interference pattern similar to the spatial pattern from the classic experiment was created. The experiment opens a window for the construction of time-varying optical instruments in a reliable and stable manner.
Prof. Binghai Yan. Unexpected enlightenment. Courtesy of the Weizmann Institute

And let there be light, more light

It started with very strange experimental results, continued in a new physical theory about the behavior of photons, and in the future may improve our smartphone screens and allow faster data communication. faster data
Light and algae in the Rosh Hankara cave. Photo by Prof. Zvi Dubinsky and the other researchers.

A unique combination of light and algae in the Rosh Nikara cave - the National Science Foundation

Measuring the light reflected from the algae makes it possible to calculate the light used for photosynthesis

Will a muon accelerator save particle physics?

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In recent years, physicists from around the world have been discussing the construction of a muon accelerator instead of other conventional accelerators based on protons or electrons. Such an accelerator has clear advantages in discovering new physics, but its construction is accompanied by many technological challenges. In this article I will review the words of Prof. Nima Arkani-Hamed from the Institute for Advanced Studies in Princeton on the need to build such an accelerator.
Premilab campus near Chicago. Photo courtesy of the Permilab National Laboratory

The largest particle accelerator in the US will undergo an upgrade and reopen after more than a decade of shutdown

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The upgrade is expected to last several years and will include the construction of a new building to house the upgraded accelerator. Permilab is also planning to build a new particle detector, which will be used to study the particles produced by the Tevatron.
organic molecules. Illustration: depositphotos.com

Identification of organic compounds using visible light

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Researchers from the University of Santiago in Chile, working in the field of machine learning, have succeeded in developing an innovative method for identifying organic compounds based on the refractive index at a single optical wavelength
Photomicrograph of superconducting (presumably) NLH. The model shown above has a diameter of one millimeter. credit: J. Adam Fenster/Univ. of Rochester

Thunderous silence following the claims of finding a conductor at room temperature

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Has a room temperature conductor finally been discovered? very doubtful The scientific community suspects the reliability of the findings and the reason for this is clear, the researcher who signed the disclosure claimed this in the past and was repelled by his colleagues claiming errors in the experiment.
Pyridine-based chloronium structure. From the study

Chloronium structures based on pyridine were discovered

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For the first time ever, researchers report the solid structure of pyridine-based chloronium ions. These compounds are known in the literature as intermediates in the oxidation reaction of secondary salts, but until now it has been very difficult to isolate them
A sealed chip used to create a magnet-based informer. Photo: Prof. Ron Polman's laboratory, Ben Gurion University

to be in two places at the same time

Scientists are trying to answer one of the biggest open questions in physics
Chuan Ha, 2023 Wolf Prize Winners in Chemistry, photo courtesy of the Prize Committee

Wolf Prize in Chemistry for 2023 to three researchers who studied RNA

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The winners are: Chuan Ha, University of Chicago, USA, Jeffrey Kelly, Scripps Research Institute, USA, Hiroaki Shuga, University of Tokyo, Japan

The advantage of entangled photons in material characterization

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Led by doctoral student Mamon Safdi and Professor Yaron Bromberg from the Hebrew University, an experiment was carried out that demonstrates for the first time a substantial advantage in characterizing materials using entangled photons over classical light. The experiment published in the prestigious journal Nature Physics measured the light from entangled photons that were backscattered from a non-static scatterer. The results of the experiment showed that entangled photons reduce the measurement error by four times than non-entangled light, thus breaking the Kramer-Rao barrier for classical light.
Quantum communication satellite. Illustration: depositphotos.com

Tel Aviv University inaugurated the first satellite observatory for quantum optical communication

The observatory, one of the most advanced in the world, will be used for tracking, sensing, hyperspectral photography and optical and quantum communication with satellites in orbit around the Earth
The photography system the researchers built: more than a million square images per second. Photo: Tel Aviv University spokesperson

The more "light" polariton particles (mixing of light and matter) contain, the faster they are

The discovery may be used as a breakthrough tool in the worlds of solar energy production, information processing and the like
Light with special chiral properties - a rotating field in the shape of the number 8. Courtesy of the researchers

An electron on the run

The scientists of the institute and their research partners showed that the chance of an electron to pass through a tunnel at the junction between a molecule and a light field, and the manner in which it will do so, depend to a large extent on the chirality of both the molecule and the light
The diagram simulates our algorithm for playing cards. The immediate effect of measuring one qubit on the others is similar to covert communication between players. Quantum computers use this effect to win the game with a higher probability compared to classical players. The diagram combines from left to right: 1) card game, 2) quantum circuit, 3) coin lottery (probability), 4) measurement of the qubits, 5) use of a classical algorithm that reduces the amount of noise, 6) analysis of the results. Design: Yael Barnea

Beats under influence

Researchers developed an algorithm that showed a basic quantum phenomenon: the immediate effect of one variable on other variables
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