An entanglement-preserving photodetector converts photon polarisation to electron spin. Up and down spin must respond equally to oppositely polarised photons, creating a requirement for degenerate spin energies, g(e) similar or equal to 0, for electrons. The authors present a plot of g(e) factor against lattice constant, analogous to bandgap against lattice constant. that can be used for g factor engineering of III-V alloys and quantum wells.
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