Pseudorandom bits and lower bounds for randomized Turing machines
Pseudorandom bits and lower bounds for randomized Turing machines
复制标题
随机图灵机的伪随机位和下界
DOI:
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发表时间:
2019
期刊:
影响因子:
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通讯作者:
Emanuele Viola
中科院分区:
文献类型:
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作者:
Emanuele Viola
. We exhibit a pseudorandom generator with nearly quadratic stretch for randomized Turing machines, which have a one-way random tape and a two-way work tape. This is the first generator for this model. Its stretch is essentially the best possible given current lower bounds. We use the generator to prove a time lower bound in the above Turing machine model extended with a two-way read-only input tape. The lower bound is of the form ? 1 + Ω ( 1 ) and is for a function computable in linear time with two quantifier alternations. Previously lower bounds were not known even for functions computable in simply exponential time.
DOI:
10.1109/focs.2018.00093
发表时间:
2018
期刊:
59th Annual IEEE Symposium on Foundations of Computer Science (FOCS 2018
影响因子:
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作者:
Forbes, Michael A.;Kelley, Zander
通讯作者:
Kelley, Zander