%0 Journal Article %T Entanglement in Theory Space %A Masahito Yamazaki %J Physics %D 2013 %I arXiv %R 10.1209/0295-5075/103/21002 %X We propose a new concept of entanglement for quantum systems: entanglement in theory space. This is defined by decomposing a theory into two by an un-gauging procedure. We provide two examples where this newly-introduced entanglement is closely related with conventional geometric entropies: deconstruction and AGT-type correspondence. %U http://arxiv.org/abs/1304.0762v2