Partitioned quantum cellular automata are intrinsically universal

Details Partitioned quantum cellular automata are intrinsically universal Partitioned quantum cellular automata are intrinsically universal

2010-10-12

arxiv.org/abs/1010.2335v1

Physics

Quantum Physics

16 pages, 7 figures. 2009 Physics and Computation workshop, special issue. Journal version: arXiv:0907.3827

Scientific paper

There have been several non-axiomatic approaches taken to define Quantum Cellular Automata (QCA). Partitioned QCA (PQCA) are the most canonical of these non-axiomatic definitions. In this work we show that any QCA can be put into the form of a PQCA. Our construction reconciles all the non-axiomatic definitions of QCA, showing that they can all simulate one another, and hence that they are all equivalent to the axiomatic definition. This is achieved by defining generalised n-dimensional intrinsic simulation, which brings the computer science based concepts of simulation and universality closer to theoretical physics. The result is not only an important simplification of the QCA model, it also plays a key role in the identification of a minimal n-dimensional intrinsically universal QCA.

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