A Near-Cubic Lower Bound for 3-Query Locally Decodable Codes from Semirandom CSP Refutation
A Near-Cubic Lower Bound for 3-Query Locally Decodable Codes from Semirandom CSP Refutation
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来自半随机 CSP 反驳的 3 查询本地可解码代码的近三次下界
DOI:
10.1145/3564246.3585143
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Manohar, Peter
中科院分区:
文献类型:
--
作者:
Alrabiah, Omar;Guruswami, Venkatesan;Kothari, Pravesh K.;Manohar, Peter
A codeC∶ {0,1}k→ {0,1}nis aq-locally decodable code (q-LDC) if one can recover any chosen bitbiof the messageb∈ {0,1}kwith good confidence by randomly querying the encodingx=C(b) on at mostqcoordinates. Existing constructions of 2-LDCs achieven= exp(O(k)), and lower bounds show that this is in fact tight. However, whenq= 3, far less is known: the best constructions achieven= exp(ko(1)), while the best known results only show a quadratic lower boundn≥ Ω(k2/log(k)) on the blocklength.In this paper, we prove a near-cubic lower bound ofn≥ Ω(k3/log6(k)) on the blocklength of 3-query LDCs. This improves on the best known prior works by a polynomial factor ink. Our proof relies on a new connection between LDCs and refuting constraint satisfaction problems with limited randomness. Our quantitative improvement builds on the new techniques for refuting semirandom instances of CSPs and, in particular, relies on bounding the spectral norm of appropriate Kikuchi matrices.
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DOI:
10.4230/lipics.approx-random.2017.30
发表时间:
2016
期刊:
Proceedings of the 54th Annual ACM SIGACT Symposium on Theory of Computing
影响因子:
--
作者:
Arnab Bhattacharyya;Sivakanth Gopi;Avishay Tal
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DOI:
10.48550/arxiv.2207.10850
发表时间:
2022
期刊:
ArXiv
影响因子:
--
作者:
Jun;Pravesh Kothari;Sidhanth Mohanty
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DOI:
10.2307/3685398
发表时间:
2004
期刊:
SubStance
影响因子:
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