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CREST HEP-QC seminar: AM10:00-, 9th Apr. (Wed) 2025

Title: Z_N lattice gauge theory: toy model for quantum simulation

Speaker: Arata Yamamoto (University of Tokyo)

Abstract: In high energy physics, realistic gauge theory has continuous gauge symmetry such as U(1) and SU(N). Quantum simulation of continuous gauge theory is however difficult due to its infinite-dimensional Hilbert space. Discrete gauge theory is used for benchmarking near-term devices and algorithms. In this seminar, I will present the introduction of Z_N lattice gauge theory and its application to quantum simulation.

CREST HEP-QC seminar: AM10:00-, 19th Feb. (Wed) 2025

Title: Improving threshold and decoding for fault-tolerant color code quantum computing

Speaker: Yugo Takada (Osaka University)

Abstract: Color codes are promising quantum error-correcting codes because they have an advantage over surface codes in that all Clifford gates can be implemented transversally. However, they also have drawbacks: decoding is difficult, and the error threshold is low. In this seminar, I will talk about two works that address these drawbacks. In Ref. [1], an Ising model formulation for decoding is proposed, and numerical results demonstrate that a decoder using this formulation achieves high accuracy. Ref. [2] presents a method to improve the error threshold by optimizing decoder weights using flag qubits. In numerical simulations, we show that the threshold has been improved compared to previous studies.
[1] Y Takada, Y Takeuchi, and K Fujii, Phys. Rev. Research 6, 013092 (2024).
[2] Y Takada and K Fujii, PRX Quantum 5, 030352 (2024).
Slide(PDF file)