Electronic states that resemble molecules and are promising for use in future quantum computers have been created in superconducting circuits by physicists at RIKEN.
The most obvious advantage of superconductors—materials that offer no electrical resistance to the flow of electrons—in electronic circuits is that they don't produce any wasteful heating, which limits the energy efficiency of conventional circuitry.
But they also have another big advantage. Superconductivity arises due to quantum-mechanical interactions between electrons. These exotic effects could be harnessed in devices, providing them with a wide range of functionality not available in conventional devices.
Now, Sadashige Matsuo of the RIKEN Center for Emergent Matter Science and co-workers have investigated just such an effect. Known as an Andreev molecule, it could be used for quantum information technologies in future quantum computers. The paper is published in the journal Nature Communications.
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