Home Science A negative correlation is demonstrated between the two spins of an entangled pair of electrons

A negative correlation is demonstrated between the two spins of an entangled pair of electrons

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When two particles are entangled, their properties are closely related even if they are far apart. The entanglement between two electrons forms a so-called Cooper pair in superconductors. These pairs are responsible for the lossless current in which the individual spins are entangled.

Scientists from the Swiss Institute for Nanoscience and the Department of Physics at the University of Basel have superconductor Spatially isolated the two electrons for several years. To achieve this, two parallel quantum dots, a nanoelectronic structure that allows only one electron to flow through each, are used.

Now the physicists University of Basel We have experimentally demonstrated for the first time that there is a negative correlation between the two spins of an entangled electron pair from a superconductor. In this study, we used a spin filter made of nanomagnets, quantum dot.

They then used small magnets to generate individually adjustable magnetic fields in each of the two quantum dots that separate the Cooper electron pairs. The spin also determines the magnetic moment of the electron, so only one spin of a given type can pass through at a time.

Using state-of-the-art experimental equipment, physicists have been able to measure that when one electron’s spin is pointing up, the other spin is pointing down, and vice versa. rice field.

Project leader Andreas Baumgartner said: “Thus, we have experimentally demonstrated a negative correlation between spins. pair electron

Lead author Dr. Arnaf Bordroy said: “Both quantum dots can be tuned so that electrons with predominantly a certain spin pass through them. For example, electrons with an upward spin pass through one pass through the other quantum dot, even though an individual electron may pass through a single quantum dot if both quantum dots are set to pass only the same spin. The quantum dot current will decrease.”

Andreas Baumgartner Conclusion, “This method allows us to detect such a negative correlation between electron spins from superconductors for the first time. So it’s not definitive proof that electron spins are entangled, but we’re working on it.”

Journal reference:

  1. Arnaf Bordroy, Valentina Zanier, Lucia Sorba, Christian Schoenenberger, Andreas Baumgartner. Spin cross-correlation experiments in electron entanglers.Nature (2022), Doi: 10.1038/s41586-022-05436-z

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