Does anybody know about an attempt to quantize teleparallel gravity? I would like to learn more about it, canonical approaches preferred: is there a sound formalism to implement the constraints / symmetries? Do we know the physical Hilbert space? Can one construct Dirac observables? Does the construction of energy carry over to the quantized version? If all this has NOT been done yet - why? Last question: can one say that Einstein-Cartan-Gravity which is the basis for canonical LQG unifies both GR + teleparallel gravity, therefore the latter one is automatically "contained" in LQG?