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The official website of Harvard University in the United States recently issued an announcement that the scientists of the School of Engineering and Applied Science (SEAS) at the University of Paulson have succeeded in transmitting electronic spin information in superconducting materials, thus overcoming one of the major challenges of quantum computing. The latest breakthrough, published in the journal Nature Physics, will lay the foundation for the construction of quantum conduction devices. Not only can the electrons carry information, but their different spin states also carry information. The "up spin" and "down spin" of electrons can be used as "0" and "1" for quantum information processing, respectively, but electrons following the principles of quantum mechanics are not only the two spin directions, but also can follow along. Spin in any direction.
If all these spin directions are used simultaneously, a more powerful new type of quantum computer will be constructed. In the field of physics branch spintronics, scientists are keen to capture and measure electron spins and attempt to construct spin-based electronic gates and circuits.
Superconducting materials do not consume any energy because of their electronic motion. They have become the best choice for scientists to develop quantum devices with low energy consumption. However, related research has long faced a big problem: Cooper electron pairs flowing within superconducting materials. The orbit is completely symmetric, the two spin directions will be completely opposite, and the final spin momentum will cancel each other to become zero, so the electron spin information cannot be transmitted.
Now, the team led by Amir Akcomb, a professor of physics at SEAS, built a simple superconducting device and found a completely new way to control the flow of electrons in superconductor materials. The superconducting device they constructed is a sandwich structure in which the upper and lower outer layers are superconductors, which will give superconductivity of deuterated mercury near the outer layer to the sandwich non-superconducting material. In such a superconducting device, the symmetry of electrons to the orbit is broken, the spins are no longer anti-symmetric (ie, the spin direction is no longer the opposite), and they alternately spin in different directions.
The research team is now able to measure the spin momentum at different sites and to adjust the spin-momentum sum of electron pairs. Yikebi said that the new research will open up new possibilities for the storage of quantum information. The unique superconducting properties of the sandwich structure will also bring new quantum materials.
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