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Quantum Advantage with Shallow Circuits Under Arbitrary Corruption

Authors Atsuya Hasegawa, François Le Gall

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Author Details

Atsuya Hasegawa
  • The University of Tokyo, Japan
François Le Gall
  • Nagoya University, Japan

Funding

JSPS KAKENHI grants Nos. JP16H01705, JP19H04066, JP20H00579, JP20H04139 and by the MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) grant No. JPMXS0120319794.

Acknowledgements

AH is grateful to Hidefumi Hiraishi and Hiroshi Imai for helpful discussions and continuous supports. FLG would also like to thank Robert König for useful discussions.

Cite As Get BibTex

Atsuya Hasegawa and François Le Gall. Quantum Advantage with Shallow Circuits Under Arbitrary Corruption. In 32nd International Symposium on Algorithms and Computation (ISAAC 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 212, pp. 74:1-74:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021) https://doi.org/10.4230/LIPIcs.ISAAC.2021.74

Abstract

Recent works by Bravyi, Gosset and König (Science 2018), Bene Watts et al. (STOC 2019), Coudron, Stark and Vidick (QIP 2019) and Le Gall (CCC 2019) have shown unconditional separations between the computational powers of shallow (i.e., small-depth) quantum and classical circuits: quantum circuits can solve in constant depth computational problems that require logarithmic depth to solve with classical circuits. Using quantum error correction, Bravyi, Gosset, König and Tomamichel (Nature Physics 2020) further proved that a similar separation still persists even if quantum circuits are subject to local stochastic noise.
In this paper, we consider the case where any constant fraction of the qubits (for instance, huge blocks of qubits) may be arbitrarily corrupted at the end of the computation. We make a first step forward towards establishing a quantum advantage even in this extremely challenging setting: we show that there exists a computational problem that can be solved in constant depth by a quantum circuit but such that even solving any large subproblem of this problem requires logarithmic depth with bounded fan-in classical circuits. This gives another compelling evidence of the computational power of quantum shallow circuits. 
In order to show our result, we consider the Graph State Sampling problem (which was also used in prior works) on expander graphs. We exploit the "robustness" of expander graphs against vertex corruption to show that a subproblem hard for small-depth classical circuits can still be extracted from the output of the corrupted quantum circuit.

Subject Classification

ACM Subject Classification
  • Theory of computation
Keywords
  • Quantum computing
  • circuit complexity
  • constant-depth circuits

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