When an off-resonant light field is coupled with atomic spins, its polarization can rotate depending on the direction of the spins via a Faraday rotation which has been used for monitoring and controlling the atomic spins. We observed Faraday rotation by an angle of more than 10 degrees for a single 1/2 nuclear spin of 171Yb atom in a high-finesse optical cavity. By employing the coupling between the single nuclear spin and a photon, we have also demonstrated that the spin can be projected or weakly measured through the projection of the transmitted single ancillary photon.
@article{arxiv.0912.4948,
title = {Faraday Rotation with Single Nuclear Spin Qubit in a High-Finesse Optical Cavity},
author = {Nobuyuki Takei and Makoto Takeuchi and Yujiro Eto and Atsushi Noguchi and Peng Zhang and Masahito Ueda and Mikio Kozuma},
journal= {arXiv preprint arXiv:0912.4948},
year = {2015}
}