Magnetic flux quantum Unit Converter

Definition of Magnetic flux quantum unit

The magnetic flux quantum is the smallest discrete amount of magnetic flux that can pass through a superconducting loop, equal to Φ0 = h/(2e) ≈ 2.068 × 10−15 weber, because paired electrons collectively carry charge 2e.

History of Magnetic flux quantum unit

The concept emerged from the development of superconductivity and the discovery that magnetic fields are expelled from superconductors. In 1961, Brian Josephson predicted quantum effects involving superconducting junctions, while independent experiments by Robert Doll and Martin Näbauer, and by Bascom Deaver and William Fairbank, observed quantized flux. The measured value supported the idea that superconducting electrons form paired states, making the relevant charge 2e. The symbol Φ0 and its precise value became fundamental in superconducting electronics, quantum interference, and later standards for electrical measurements.

Applications of Magnetic flux quantum unit

Today, the magnetic flux quantum is used to describe flux quantization in superconducting rings and Josephson junctions. It underpins SQUID magnetometers, which detect exceptionally weak magnetic fields, and supports superconducting qubits, voltage standards, and precision metrology. It also provides a convenient scale for analyzing vortices in type-II superconductors and magnetic interference devices.

Complete list of Magnetic flux quantum unit conversion