The continuous weak measurement of cold spin in an ensemble of laser cooled Cs atoms was carried out using linear Faraday effect. It was showed that the probe light shift lead to nonlinearity in the spin dynamics which limited the Fraraday measurement window. A nonperturbing measurement on the much longer time scale set by decoherence was possible by removing the nonlinearity. The nonlinear spin Hamiltonian was found to be useful for the studies of quantum chaos and real-time quantum state estimation.
ASJC Scopus subject areas
- Physics and Astronomy(all)