Qubit-Initialisation and Readout with Finite Coherent Amplitudes in Cavity QED - Quantum PhysicsReport as inadecuate




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Abstract: We consider a unitary transfer of an arbitrary state of a two-level atomicqubit in a cavity to the finite amplitude coherent state cavity field. Suchtransfer can be used to either provide an effective readout measurement on theatom by a subsequent measurement on the light field or as a method forinitializing a fixed atomic state - a so-called -attractor state-, studiedpreviously for the case of an infinitely strong cavity field. We show that witha suitable adjustment of the coherent amplitude and evolution time the qubittransfers all its information to the field, attaining a selected state of highpurity irrespectively of the initial state.



Author: Ricardo Kennedy, Leonhard Horstmeyer, Andrzej Dragan, Terry Rudolph

Source: https://arxiv.org/







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