[Resource Topic] 2024/629: Unconditional correctness of recent quantum algorithms for factoring and computing discrete logarithms

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Title:
Unconditional correctness of recent quantum algorithms for factoring and computing discrete logarithms

Authors: Cédric Pilatte

Abstract:

In 1994, Shor introduced his famous quantum algorithm to factor integers and compute discrete logarithms in polynomial time. In 2023, Regev proposed a multi-dimensional version of Shor’s algorithm that requires far fewer quantum gates. His algorithm relies on a number-theoretic conjecture on the elements in (\mathbb{Z}/N\mathbb{Z})^{\times} that can be written as short products of very small prime numbers. We prove a version of this conjecture using tools from analytic number theory such as zero-density estimates. As a result, we obtain an unconditional proof of correctness of this improved quantum algorithm and of subsequent variants.

ePrint: https://eprint.iacr.org/2024/629

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