A Polylogarithmic PRG for Degree $2$ Threshold Functions in the Gaussian Setting
A Polylogarithmic PRG for Degree $2$ Threshold Functions in the Gaussian Setting
复制标题
高斯设置下 2$ 次阈值函数的多对数 PRG
DOI:
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发表时间:
2014
期刊:
影响因子:
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通讯作者:
D. Kane
中科院分区:
文献类型:
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作者:
D. Kane
We construct and analyze a new pseudorandom generator for degree 2 polynomial threshold functions with respect to the Gaussian measure. In particular, we obtain one whose seed length is polylogarithmic in both the dimension and the desired error, a substantial improvement over existing constructions.
Our generator is obtained as an appropriate weighted average of pseudorandom generators against read once branching programs. The analysis requires a number of ideas including a hybrid argument and a structural result that allows us to treat our degree 2 threshold function as a function of a number of linear polynomials and one approximately linear polynomial.