Continuous measurement with traveling wave probes

Details Continuous measurement with traveling wave probes Continuous measurement with traveling wave probes

2002-10-08

arxiv.org/abs/quant-ph/0210056v2

Phys. Rev. A (68) 13817 (2003)

Physics

Quantum Physics

9 pages, 2 figures, Update to clarify some points, and change small errors

Scientific paper

10.1103/PhysRevA.68.013817

We consider the use of a traveling wave probe to continuously measure the quantum state of an atom in free space. Unlike the more familiar cavity QED geometry, the traveling wave is intrinsically a multimode problem. Using an appropriate modal decomposition we determine the effective measurement strength for different atom-field interactions and different initial states of the field. These include the interaction of a coherent-state pulse with an atom, the interaction of a Fock-state pulse with an atom, and the use of Faraday rotation of a polarized laser probe to perform a QND measurement on an atomic spin.

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