Quantum Random Walks Hit Exponentially Faster

Details Quantum Random Walks Hit Exponentially Faster Quantum Random Walks Hit Exponentially Faster

2002-05-14

arxiv.org/abs/quant-ph/0205083v1

Probability Theory and Related Fields, Vol. 133(2), p. 215-235 (2005), conference version in Proc. 7th RANDOM, p. 354-69, 2003

Physics

Quantum Physics

15 pages, no Figures

Scientific paper

We show that the hitting time of the discrete time quantum random walk on the n-bit hypercube from one corner to its opposite is polynomial in n. This gives the first exponential quantum-classical gap in the hitting time of discrete quantum random walks. We provide the framework for quantum hitting time and give two alternative definitions to set the ground for its study on general graphs. We then give an application to random routing.

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