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arXiv:1311.7558 · International Journal of Theoretical Physics

Selective Transfer of Superposition of Coherent States by Exploiting a Cavity QED System

Naghi Behzadi, Sobhan Kazemi Rudsary

Published Oct 15, 2014• 0 citations
arXivHTMLPDF
DOI
10.1007/s10773-014-2361-9

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A scheme is proposed for generating the superpositions of several coherent states in a cavity field with dispersive cavity quantum electrodynamics (QED). In the scheme, a sequence of atoms interacts dispersively with the cavity field, connected with a microwave source, and is manipulated by classical fields, followed by state-selective measurements. In this way, the cavity field is collapsed onto a superposition of several coherent states along a straight line with controllable coefficients. This scheme provides the possibility for quantum state engineering via coherent-state superpositions in cavity QED for the first time.
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 a 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 irrespective of the initial state.