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LEDs that emit tangled light

29.03.2014

Scientists from the University of Toronto have developed a scheme for the operation of LEDs that can emit entangled photons due to an additional superconducting layer.

Ordinary LEDs emit photons that are not correlated with each other in any way. To obtain entangled light, physicists supplemented conventional LEDs with a layer of superconducting substance. This substance contains the so-called Cooper pairs, i.e. bound pairs of electrons. The use of such electrons in the emission of light leads to the appearance of entangled pairs of photons.

For reference: "entangled" particles are particles whose quantum properties are strictly correlated with each other. For example, by measuring the polarization of one member of a pair of entangled photons, one can obtain information about the other, no matter where it is at that moment. So far, entangled photons have been obtained only by manipulating individual cooled atoms, NV vacancies in diamonds (ie, electron pairs of individual nitrogen located in a carbon crystal), as well as quantum dots.

Reliable and simple sources of entangled photons are of great importance for quantum cryptography. Such photons are used in it to transfer the key between the interlocutors. Recently, scientists have learned how to apply quantum entangled light also in microscopy. It was found that the contrast of micrographs taken in entangled light is almost a third higher than the typical quantum limit of clarity for ordinary photons.

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