![]() The research, which was recently published in Nature, is considered an important step toward further experimental investigations of quantum mechanical phenomena, such as the entanglement of particles in solids, which is also a key component of quantum computers.Devices in Everspace 2 don’t require any energy but all of them have an internal cooldown. "Our experiments are a first step, but not yet a definitive proof of entangled electron spins, since we cannot set the orientation of the spin filters arbitrarily - but we are working on it." "With this method, we were able to detect such negative correlations between electron spins from a superconductor for the first time," Andreas Baumgartner concludes. If both quantum dots are set to pass only the same spins, the electric currents in both quantum dots are reduced, even though an individual electron may well pass through a single quantum dot." "For example, an electron with spin up passes through one quantum dot and an electron with spin down passes through the other quantum dot, or vice versa. "We can adjust both quantum dots so that mainly electrons with a certain spin pass through them," explains first author Dr. Since the spin also determines the magnetic moment of an electron, only one particular type of spin is allowed through at a time. Using tiny magnets, they generated individually adjustable magnetic fields in each of the two quantum dots that separate the Cooper pair electrons. The researchers achieved this by using a spin filter they developed in their laboratory. ![]() "We have thus experimentally proven a negative correlation between the spins of paired electrons," explains project leader Andreas Baumgartner. Using an innovative experimental setup, the physicists were able to measure that the spin of one electron points upwards when the other is pointing downwards, and vice versa. Lucia Sorba from the Istituto Nanoscienze-CNR and the Scuola Normale Superiore in Pisa have now been able to experimentally demonstrate what has long been expected theoretically: electrons from a superconductor always emerge in pairs with opposite spins. Andreas Baumgartner, in collaboration with researchers led by Prof. Opposite electron spins from Cooper pairs This is achieved by means of two quantum dots - nanoelectronic structures connected in parallel, each of which only allows single electrons to pass. In a superconductor, the electrons form so-called Cooper pairs responsible for the lossless electrical currents and in which the individual spins are entangled.įor several years, researchers at the Swiss Nanoscience Institute and the Department of Physics at the University of Basel have been able to extract electron pairs from a superconductor and spatially separate the two electrons. Two electrons can be entangled as well - for example in their spins. Albert Einstein described entanglement as a "spooky action at a distance." Research on entanglement between light particles (photons) was awarded this year's Nobel Prize in Physics. If entangled, certain properties of the two particles are closely linked, even when far apart. The entanglement between two particles is among those phenomena in quantum physics that are hard to reconcile with everyday experiences.
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