Exploiting the Difference in Probability Calculation between Quantum and Probabilistic Computations(<Special Section>Discrete Mathematics and Its Applications)

概要

論文の詳細を見る
The main purpose of this paper is to show that we can exploit the difference (l_i -norm and l_2-norm) in the probability calculation between quantum and probabilistic computations to claim the difference in their space efficiencies. It is shown that there is a finite language L which contains sentences of length up to O(n^<c+1>) such that: (i) There is a one-way quantum finite automaton (qfa) of O(n^<C+4>) states which recognizes L. (ii) However, if we try to simulate this qfa by a probabilistic finite automaton (pfa) using the same algorithm, then it needs Ω(n^<2c+4>) states. It should be noted that we do not prove real lower bounds for pfa's but show that if pfa's and qfa's use exactly the same algorithm, then qfa's need much less states.
社団法人電子情報通信学会の論文
2004-05-01