Recently I've came by this article: "Intercontinental quantum liaisons between entangled electrons in ion traps of thermoluminescent crystals" by Robert Desbrandes and Daniel Van Gent http://arxiv.org/abs/quant-ph/0611109 Researchers used ion traps caused by imperfections of the crystals to "store" the entangled particles. Then they concluded an experiment in which one of the crystals was heated and the effect of this action was observed on the second crystal miles away. Their results show that such a communication really took place and was resistant to outside factors to a good extent. That was really an inspiring reading for me. But I was surprised that the paper was published in 2006 and during all these years no commercial solutions where built on this idea. My question is why? It looks trivial to build a protocol on top of the temperature changes to allow communication. Can anyone uncover the downsides here?