Eur. Phys. J. D (2013) 67: 5
https://doi.org/10.1140/epjd/e2012-30391-x

Regular Article

Genuine entanglement among coherent excitonic states of three quantum dots located individually in separated coupled QED cavities

¹ Research Institute for Fundamental Sciences, University of Tabriz, 51666-16471 Tabriz, Iran
² Faculty of Physics, Department of Theoretical Physics and Astrophysics, University of Tabriz, 51666-16471 Tabriz, Iran
³ Photonics Group, Research Institute for Applied Physics and Astronomy, University of Tabriz, 51666-16471 Tabriz, Iran

^a e-mail: n.behzadi@tabrizu.ac.ir

Received: 20 June 2012
Received in final form: 27 November 2012
Published online: 24 January 2013

Abstract

New scheme for generating genuine three-partite entanglement among three quantum dots (QDs) is proposed. The QDs are trapped in an one-dimensional (1D) array of three equidistance single-mode coupled cavities. Photon hopping is considered to be responsible for coupling between the cavities. The effective dynamics of the system leads to generate genuine three-partite entangled coherent excitonic states in QDs. The entanglement of these states, after encoding as three-qubit system, can be detected by entanglement witnesses (EWs) based on GHZ-states. It is shown that the generated entangled states can be arbitrarily very close to the GHZ-states.