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Journal of Physics B Atomic Molecular and Optical Physics

Comment on ‘Generation of cluster-type entangled coherent states’

Haihong Wei, Faqiang Wang

Published Oct 5, 2010• 1 citation
Publisher

Abstract

We rectify some errors in the scheme of generating cluster-type entangled coherent states (CTECS) proposed by Tang (2009 J. Phys. B: At. Mol. Opt. Phys. 42 085502) in this comment. Furthermore, we find that no system can successfully generate CTECS by Tang's method.
DOI
10.1088/0953-4075/43/20/208001

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We respond to the criticism of our paper 'Generation of cluster-type entangled coherent states'. In the original paper, we remove the explicit time dependence from the interaction Hamiltonian by transforming to a rotating frame for the field operators, which is also done to quantum dots embedded in a microcavity (Djuric and Search 2007 Phys. Rev. B 75 155307). We thank Wei Haihong and Wang Faqiang for pointing out that cluster-type entangled coherent states (CTECS) cannot be obtained with the original time-dependent Hamiltonian under certain parameter condition ? |?|. For the original field operators, we present a new method to generate CTECS in the same system.
We consider a type of (M+N)(M+N)(M+N)-mode entangled coherent states and propose a simple deterministic scheme to generate these states that can fly freely in space. We then exploit such free-flying states to teleport certain kinds of superpositions of multimode coherent states. We also address the issue of manipulating size and type of entangled coherent states by means of linear optics elements only.