Measurement of non-commuting spin components using spin-orbit interaction

Details Measurement of non-commuting spin components using spin-orbit interaction Measurement of non-commuting spin components using spin-orbit interaction

2011-05-26

arxiv.org/abs/1105.5359v2

Phys.Rev.A 84, 030101(R) (2011)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

We analyze the physical meaning of a possible experiment aimed at the simultaneous measurement of two non-commuting spin components. We demonstrate that switching of a strong spin-orbit interaction, e.g., in a solid state or a cold-atom system, for a short period of time simulates a simultaneous von Neumann measurement of spin components, $\sigma_x$ and $\sigma_y$. By mapping spin dynamics onto coordinate-space motion, such a measurement determines time averages of $\sigma_x$ and $\sigma_y$ which, unlike their instantaneous values, may be evaluated simultaneously to an arbitrary accuracy.

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