Physicists at the University of Toronto in Canada presented a new approach to the efficient use of quantum entanglement in the latest issue of the Physical Review. This new approach combines light emitting diodes (LEDs) with superconductors to create entangled photons. The development of quantum computers and quantum communication devices opens a new window.
Quantum entanglement is a phenomenon in which particles interact with each other in a system of two or more particles, no matter how far away they are. By measuring the characteristics of one particle in the entanglement pair, one can know the other. This is one of the most confusing aspects of quantum mechanics, which Einstein calls "long-range ghost behavior."
“Photons emitted from conventional light sources such as LEDs show randomness without any correlation,†explains Aix-Hayette, a researcher at the Canadian Advanced Technology Institute. “New studies have shown that the entanglement of photons emitted by LEDs can be By adding another unique physical effect - superconductivity."
Superconductivity means that the resistance of some materials can be reduced to zero under low temperature conditions. This phenomenon occurs when electrons are entangled with a Cooper pair, where one electron spins in one direction and the other electron Then spin in the opposite direction. When a layer of superconducting material is in close contact with a semiconductor LED structure, the Cooper pair injects the LED. Entangling the pair creates an entangled photon pair. This effect was originally found in LEDs that use nanometer-thick active regions, quantum wells.
Hayter said that, usually, quantum properties occur at very small scales—an electron or atom, and superconductivity allows quantum effects to appear on large scale—an electronic device or an entire circuit. This kind of quantum behavior can significantly increase the radiation of light in general, and in special cases it can entangle photon radiation. (Reporter Feng Weidong)
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