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We show that the edge of a two-dimensional topological insulator can be usedto construct a solid state Stern-Gerlach spin-splitter. By threading such aStern-Gerlach apparatus with a magnetic flux, Ahranov-Bohm like interferenceeffects are introduced. Using ferromagnetic leads, the setup can be used toboth measure magnetic flux and as a spintronics switch. With normal metallicleads a switchable spintronics NOT-gate can be implemented. Furthermore, weshow that a sequence of such devices can be used to construct a single-qubit$SU(2)$-gate, one of the two gates required for a universal quantum computer.The field sensitivity, or switching field, $b$ is related to the devicecharacteristic size $r$ through $b = \frac{\hbar}{qr^2}$, with $q$ the unit ofelectric charge.

Solid state Stern-Gerlach spin-splitter for magnetic field sensoring, spintronics, and quantum computing