Continuous Weak Measurement and Nonlinear Dynamics in a Cold Spin Ensemble

Details Continuous Weak Measurement and Nonlinear Dynamics in a Cold Spin Ensemble Continuous Weak Measurement and Nonlinear Dynamics in a Cold Spin Ensemble

2004-03-12

arxiv.org/abs/quant-ph/0403096v2

Phys. Rev. Lett. 93 p.163602 (October 15, 2004)

Physics

Quantum Physics

4 pages ReVTeX4 with 4 figures, modified text and figures in response to referee comments

Scientific paper

10.1103/PhysRevLett.93.163602

A weak continuous quantum measurement of an atomic spin ensemble can be implemented via Faraday rotation of an off-resonance probe beam, and may be used to create and probe nonclassical spin states and dynamics. We show that the probe light shift leads to nonlinearity in the spin dynamics and limits the useful Faraday measurement window. Removing the nonlinearity allows a non-perturbing measurement on the much longer timescale set by decoherence. The nonlinear spin Hamiltonian is of interest for studies of quantum chaos and real-time quantum state estimation.

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