Michael A. Nielsen. A geometric approach to quantum circuit lower bounds. Quantum Information & Computation, 6(3):213-262, 2006. [doi]
@article{Nielsen06-2, title = {A geometric approach to quantum circuit lower bounds}, author = {Michael A. Nielsen}, year = {2006}, url = {http://portal.acm.org/citation.cfm?id=2011688}, researchr = {https://researchr.org/publication/Nielsen06-2}, cites = {0}, citedby = {0}, journal = {Quantum Information & Computation}, volume = {6}, number = {3}, pages = {213-262}, }