The ZX-calculus is incomplete for quantum mechanics

Christian Schröder de Witt
Vladimir Zamdzhiev
(University of Oxford)

We prove that the ZX-calculus is incomplete for quantum mechanics. We suggest the addition of a new 'color-swap' rule, of which currently no analytical formulation is known and which we suspect may be necessary, but not sufficient to make the ZX-calculus complete.

In Bob Coecke, Ichiro Hasuo and Prakash Panangaden: Proceedings of the 11th workshop on Quantum Physics and Logic (QPL 2014), Kyoto, Japan, 4-6th June 2014, Electronic Proceedings in Theoretical Computer Science 172, pp. 285–292.
Published: 28th December 2014.
ArXived at: https://dx.doi.org/10.4204/EPTCS.172.20 bibtex PDF
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