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physics

Particle physicsPhysics

New Observations of Group Delay in Multiphoton Processes

Scientists in Canada have made a groundbreaking advance in the field of quantum optics by observing group delay phenomena induced by gain during spontaneous parametric down-conversion (SPDC). In SPDC, a single high-energy photon is converted into two lower-energy “daughter” photons. Previous studies had largely focused on scenarios with a low probability of such photon conversions. However, by increasing the intensity of the pump laser, the researchers were able to generate multiple photon pairs simultaneously, ultimately revealing a measurable shift in the arrival times of the daughter photons.
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Why is water so important for living organisms?
Biology

Why is water so important to living organisms?

Water, although it is a very simple molecule, because it consists of only 3 atoms - one oxygen and two hydrogen - is the foundation of life on Earth, and probably in the universe at all (if we find one). It is not without reason that when observing distant solar systems, astronomers look for planets that are in the so-called habitable zone, i.e. the habitable zone enabling, among others, the occurrence of liquid water. But let's go back to Earth and look at water from the side of its properties important for life ...
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