- Dicke regime


We create entangled states of the spin and motion of a single Ca ion in a linear ion trap. The motional part consists of coherent states of large separation and long coherence time. The states are created by driving the motion using counterpropagating laser beams. We theoretically study and experimentally observe the behaviour outside the Lamb-Dicke regime, where the trajectory in phase space is modified and the coherent states become squeezed. We directly observe the modification of the return time of the trajectory, and infer the squeezing. The mesoscopic entanglement is observed up to ∆α = 5.1 with coherence time 170μs and mean phonon excitation n̄ = 16.

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@inproceedings{McDonnell2006DR, title={- Dicke regime}, author={Melissa Jane McDonnell and J. P. Home and David M . Lucas and Gabriela Imreh and B . C . Keitch and D . J . Szwer and Nicholas R Thomas and Stephen Webster and Andrew M. Steane}, year={2006} }