Conditional evolution in single-atom cavity QED

Details Conditional evolution in single-atom cavity QED Conditional evolution in single-atom cavity QED

2001-04-26

arxiv.org/abs/quant-ph/0104128v2

Phys. Rev. A 65, 013804 (2002)

Physics

Quantum Physics

15 pages, 1 postscript figure, added discussion of model

Scientific paper

10.1103/PhysRevA.65.013804

We consider a typical setup of cavity QED consisting of a two-level atom interacting strongly with a single resonant electromagnetic field mode inside a cavity. The cavity is resonantly driven and the output undergoes continuous homodyne measurements. We derive an explicit expression for the state of the system conditional on a discrete photocount record. This expression takes a particularly simple form if the system is initially in the steady state. As a byproduct, we derive a general formula for the steady state that had been conjectured before in the strong driving limit.

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