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Quantum measurement

A single spin made visible

In 1845, Faraday noted that the plane of polarization of light is rotated when a light beam travels through a material in a magnetic field. Now, Faraday rotation due to one single electron spin has been observed.

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Figure 1: Faraday rotation due to a single spin.

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Vandersypen, L. A single spin made visible. Nature Phys 3, 83–84 (2007). https://doi.org/10.1038/nphys528

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