Canada proposed a new way to effectively use quantum entanglement

Physicists from the University of Toronto in Canada have introduced a groundbreaking method for harnessing quantum entanglement more efficiently. Their findings, published in the latest issue of *Physical Review Letters*, reveal how combining light-emitting diodes (LEDs) with superconducting materials can generate entangled photons. This innovation holds great promise for the future of quantum computing and secure quantum communication systems. Quantum entanglement is one of the most fascinating and puzzling aspects of quantum mechanics. It occurs when two or more particles become interconnected in such a way that the state of one particle instantly influences the state of another, no matter how far apart they are. Albert Einstein famously referred to this as "spooky action at a distance." By measuring one particle in an entangled pair, scientists can immediately determine the properties of the other, even if it's located on the other side of the universe. According to Aix-Hayette, a researcher at the Canadian Advanced Technology Institute, traditional light sources like LEDs emit photons in a random and uncorrelated manner. However, recent research has shown that by introducing superconductivity into the system, photons emitted from LEDs can be entangled. This breakthrough opens new possibilities for generating and controlling entangled photon pairs at a larger scale. Superconductivity occurs when certain materials, when cooled to very low temperatures, exhibit zero electrical resistance. This phenomenon arises from the formation of Cooper pairs—pairs of electrons that move together through the material. When a superconducting layer is placed in close proximity to a semiconductor LED, these Cooper pairs can inject into the LED structure. As a result, the electrons interact in a way that generates entangled photon pairs. This effect was first observed in LEDs with ultra-thin active regions, known as quantum wells. Hayter explains that while quantum effects typically occur at the atomic or subatomic level, superconductivity allows these phenomena to manifest on a macroscopic scale, such as in electronic circuits or devices. This capability not only enhances light emission but also enables the creation of entangled photon radiation under specific conditions. Such advancements could revolutionize fields like quantum information processing and secure data transmission. (Reporter: Feng Weidong)

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