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Heat provides a simple way to separate entangled electrons for research The thermoelectric effect can be used to produce entangled electrons, according to scientists from Finland, Russia, China and the USA. The proof-of-concept device is based on superconductivity, and combines a patterned single-layer graphene sheet (green) and metal (blue) electrodes on a silicon dioxide substrate (grey). Superconductivity is caused by entangled pairs of electrons called Cooper pairs. These pairs enter through one electrode in the device and leave separately through two more (see photo and below), split by a temperature difference. “The resulting electrons remain entangled despite being separated for quite long distances,” said researcher Nikita Kirsanov of Aalto University in Finland. ....
E-Mail IMAGE: False-colour electron microscope image of the sample, the green layers are graphene on top of the grey superconductor. The blue metal electrodes are used to extract the entangled electrons view more Credit: Aalto University A joint group of scientists from Finland, Russia, China and the USA have demonstrated that temperature difference can be used to entangle pairs of electrons in superconducting structures. The experimental discovery, published in Nature Communications, promises powerful applications in quantum devices, bringing us one step closer towards applications of the second quantum revolution. The team, led by Professor Pertti Hakonen from Aalto University, has shown that the thermoelectric effect provides a new method for producing entangled electrons in a new device. Quantum entanglement is the cornerstone of the novel quantum technologies. This concept, however, has puzzled many physicists over the years, including Alb ....