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In this paper, I present a simple method of obtaining spin-polarised currentfrom a QPC with a large Rashba interaction. The origin of this spinpolarisation is the adiabatic evolution of spin "up" of the first QPC sub-band,into spin "down" of the second QPC sub-band. Unique experimental signatures ofthis effect can be obtained using a magnetic focusing setup, with thecharacteristic "double" peak of spin-split magnetic focusing only present forconductances $G>2e^2/h$. These particular magnetic focusing features arepresent in recently publish experimental results. Finally, I consider holeQPCs, where due to the particular kinematic structure of the Rashbainteraction, the required parameters are much less favourable for experimentalrealisation.

A quantum point contact as a (near) perfect spin polariser