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Improved Two-source Extractors against Quantum Side Information

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arxiv 2503.05528 v1 pith:ELOVFUV5 submitted 2025-03-07 quant-ph cs.CR

classification quant-phcs.CR
keywords extractorinformationquantumsidetwo-sourceextractorsallowsclassical
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Two-source extractors aim to extract randomness from two independent sources of weak randomness. It has been shown that any two-source extractor which is secure against classical side information remains secure against quantum side information. Unfortunately, this generic reduction comes with a significant penalty to the performance of the extractor. In this paper, we show that the two-source extractor from Dodis et al. performs equally well against quantum side information as in the classical realm, surpassing previously known results about this extractor. Additionally, we derive a new quantum XOR-Lemma which allows us to re-derive the generic reduction but also allows for improvements for a large class of extractors.

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Cited by 1 Pith paper

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  1. An efficient construction of Raz's two-source randomness extractor with improved parameters

    cs.CR 2025-06 conditional novelty 7.0 of 10

    A quasi-linear-time version of Raz's two-source extractor with reduced entropy requirements, quantum-proof variants, and an open-source implementation.

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