# Flux Quantization in a Superconducting Loop (SQUID)

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**Formula:** `Φ = nΦ₀`

In superconductivity, flux quantization is a fundamental principle where the magnetic flux ('** Φ**') in a superconducting loop is quantized and only consists of an integer number of flux quanta ('

**'). The flux quantum is the quantum of magnetic flux passing through a superconductor and is a constant value approximately equal to 2.067833831e-15 Wb (weber). In the formula, '**

*Φ₀***' is an integer that represents the number of flux quanta. The resulting flux is then an integer multiple of the flux quantum, showing the discrete nature of the magnetic flux in a superconducting ring, which is especially relevant for Superconducting Quantum Interference Devices (SQUIDs).**

*n*Tags: Superconductivity, Quantum Mechanics, SQUID, Flux Quantization