Passive quantum error correction with linear optics

Recently it was proposed by Kalarnidas in [D. Kalamidas, Phys. Lett. A 343 (2005) 331] an optical set-up able to correct single qubit errors using Pockels cells. In this work, we present a different set-up able to realize error correction passively, in the sense that none external action is needed. (c) 2005 Elsevier B.V. All rights reserved.