This is a narrow constriction in a ring of superconductor. Current can only move around the ring because of quantum laws; the apparatus provides a neat way to investigate the properties of quantum mechanics and is a technology to build qubits for quantum computers.
Dive into the quantum world
For a quick dip into quantum physics, we recommend you browse our Quantum A to Z. You can also read what famous physicists have said about this famously puzzling physics theory. If you’re after more depth, check out our recommendations for popular science books and longer articles. And for the very latest quantum news, see what our media partners Scientific American and Nature are reporting.
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