Qubit-Initialisation and Readout with Finite Coherent Amplitudes in Cavity QED

Details Qubit-Initialisation and Readout with Finite Coherent Amplitudes in Cavity QED Qubit-Initialisation and Readout with Finite Coherent Amplitudes in Cavity QED

2010-06-04

arxiv.org/abs/1006.0947v1

Physics

Quantum Physics

6 pages, 4 figures

Scientific paper

We consider a unitary transfer of an arbitrary state of a two-level atomic qubit in a cavity to the finite amplitude coherent state cavity field. Such transfer can be used to either provide an effective readout measurement on the atom by a subsequent measurement on the light field or as a method for initializing a fixed atomic state - a so-called "attractor state", studied previously for the case of an infinitely strong cavity field. We show that with a suitable adjustment of the coherent amplitude and evolution time the qubit transfers all its information to the field, attaining a selected state of high purity irrespectively of the initial state.

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