All reports by Author Luowen Qian:

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TR23-204
| 17th November 2023
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John Bostanci, Luowen Qian, Nicholas Spooner, Henry Yuen#### An efficient quantum parallel repetition theorem and applications

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TR20-090
| 10th June 2020
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Kai-Min Chung, Siyao Guo, Qipeng Liu, Luowen Qian#### Tight Quantum Time-Space Tradeoffs for Function Inversion

Revisions: 1

John Bostanci, Luowen Qian, Nicholas Spooner, Henry Yuen

We prove a tight parallel repetition theorem for 3-message computationally-secure quantum interactive protocols between an efficient challenger and an efficient adversary. We also prove under plausible assumptions that the security of 4-message computationally secure protocols does not generally decrease under parallel repetition. These mirror the classical results of Bellare, Impagliazzo, ... more >>>

Kai-Min Chung, Siyao Guo, Qipeng Liu, Luowen Qian

In function inversion, we are given a function $f: [N] \mapsto [N]$, and want to prepare some advice of size $S$, such that we can efficiently invert any image in time $T$. This is a well studied problem with profound connections to cryptography, data structures, communication complexity, and circuit lower ... more >>>