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• W2953240106 abstract "Randomness is a vital resource for modern day information processing, especially for cryptography. A wide range of applications critically rely on abundant, high quality random numbers generated securely. Here we show how to expand a random seed at an exponential rate without trusting the underlying quantum devices. Our approach is secure against the most general adversaries, and has the following new features: cryptographic level of security, tolerating a constant level of imprecision in the devices, requiring only a unit size quantum memory per device component for the honest implementation, and allowing a large natural class of constructions for the protocol. In conjunct with a recent work by Chung, Shi and Wu, it also leads to robust unbounded expansion using just 2 multi-part devices. When adapted for distributing cryptographic keys, our method achieves, for the first time, exponential expansion combined with cryptographic security and noise tolerance. The proof proceeds by showing that the Renyi divergence of the outputs of the protocol (for a specific bounding operator) decreases linearly as the protocol iterates. At the heart of the proof are a new uncertainty principle on quantum measurements, and a method for simulating trusted measurements with untrusted devices." @default.
• W2953240106 created "2019-06-27" @default.
• W2953240106 creator A5022499594 @default.
• W2953240106 creator A5063535590 @default.
• W2953240106 date "2014-02-03" @default.
• W2953240106 modified "2023-10-18" @default.
• W2953240106 title "Robust protocols for securely expanding randomness and distributing keys using untrusted quantum devices" @default.
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• W2953240106 doi "https://doi.org/10.48550/arxiv.1402.0489" @default.
• W2953240106 hasPublicationYear "2014" @default.
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