Physics – Quantum Physics
Scientific paper
2005-06-22
Phys. Rev. A 72, 043823 (2005)
Physics
Quantum Physics
13 pages, 6 figures
Scientific paper
10.1103/PhysRevA.72.043823
We discuss continuous observation of the momentum of a single atom by employing the high velocity sensitivity of the index of refraction in a driven $\Lambda$-system based on electromagnetically induced transparency (EIT). In the ideal limit of unit collection efficiency this provides a quantum limited measurement with minimal backaction on the atomic motion. A feedback loop, which drives the atom with a force proportional to measured signal, provides a cooling mechanism for the atomic motion. We derive the master equation which describes the feedback cooling and show that in the Lamb-Dicke limit the steady state energies are close to the ground state, limited only by the photon collection efficiency. Outside of the Lamb-Dicke regime the predicted temperatures are well below the Doppler limit.
Rabl Peter
Steixner Viktor
Zoller Peter
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