Box transformation. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Box transformation. Focus Secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

The magician picks up a matchbox, shakes it slightly - and everyone hears the sound of knocking matches. Then he wraps the box in a handkerchief and shakes it again - again the sound of a full box. The magician puts the handkerchief with the box on the table and asks someone to open the box. That one is empty - the matches are gone.

Focus secret:

The magician has two boxes (one is half filled with matches, the other is empty). A box of matches is hidden in advance in the sleeve. You can use a shirt cuff to secure it or make a rubber bracelet ring into which the boxes will be inserted.

The magician takes the empty box in the hand where the matchbox is hidden. Makes shaking movements. And so on. While unfolding the handkerchief to make sure that the box lying there is empty, the magician should try not to move his hand with the box too much so that the sound does not reveal his trick.

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Random news from the Archive

Interaction of photons with pairs of atoms 25.08.2021

Scientists from the Federal Polytechnic School of Lausanne (EPFL) have for the first time forced photons to interact with pairs of atoms. This breakthrough is important for the field of resonator quantum electrodynamics (QED), an advanced field that underpins quantum technologies.

Humanity is moving towards the widespread use of technologies based on quantum physics. But to achieve this, you first need to master how to make light interact with matter - or, to be more precise, photons with atoms. To some extent, the advanced field of resonator quantum electrodynamics (QED) is responsible for such technologies. Now it is already used in quantum networks and quantum information processing. But there is still a long way to go. The current interactions of light and matter are limited to single atoms, which limits the ability of humans to study them in the form of complex systems involved in quantum technologies.

In the new work, the researchers used a Fermi gas (or Fermi-Dirac ideal gas). This is a gas consisting of particles that satisfy the Fermi-Dirac statistics, that is, they have a small mass and a high concentration. For example, electrons in a metal. “In the absence of photons, gas can be obtained in a state where atoms interact with each other, forming loosely bound pairs,” explains Jean-Philippe Brantou from the EPFL School of Basic Sciences. “When light enters a gas, some of these pairs turn into chemically bonded molecules, being absorbed photons".

The key concept of the new effect is that it happens "coherently". This means that a photon is absorbed to turn a couple of atoms into a molecule, then emitted back and so on several times. The para-photon system forms a new type of particle state, which is called pair polariton-polariton. This was made possible by a system where photons are trapped in one place, where they have to interact strongly with atoms.

Hybrid pair polaritons acquire some of the properties of photons. This means that they can be measured by optical methods. They also take on some of the properties of a Fermi gas.

In the future, the technology will come in handy in quantum chemistry: scientists have demonstrated for the first time how certain chemical reactions can be coherently produced using single photons.

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