173rd RQC Seminar

• 講演者

  Prof. Yangsen Ye
  (Department of Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China)

• 日程

  2024/12/06(金) 15:15-16:45

• 開催場所

  ハイブリッド（ZOOM・ 和光地区 総合支援棟2階 大会議室）

• 講演タイトル

  Title 1: Digital Quantum Simulations of Quantum Thermodynamic Phases and Phase Transitions
  Title 2: Realization of an Error-Correcting Surface Code with Superconducting Qubits

• お問合せ

  yutaka.tabuchi[at]riken.jp

講演概要
Abstract1: Characterizing quantum phases of matter and phase transitions at finite temperatures is crucial for understanding complex materials and large-scale thermodynamic phenomena. Classical simulations struggle with the exponential complexity of studying these phases, whereas digital quantum simulations offer a promising alternative. In this talk, we will employ a novel quantum algorithm on our superconducting quantum processors to explore finite-temperature phases and transitions of quantum magnets. By applying this approach to one- and two-dimensional transverse field Ising models (TFIM), we gain insights into the quantum ferromagnetic-paramagnetic duality in one dimension and finite-temperature criticality in two dimensions.

Abstract 2: Abstract: Quantum error correction is a pivotal technique for transitioning from noisy intermediate-scale quantum devices to fully functional quantum computers. The surface code, with its high threshold error rate, is the leading quantum error correction code for two-dimensional grid architectures. Despite its potential, the repeated error correction capability of the surface code has not been experimentally realized thus far. In this talk, we will present our experimental implementation of an error-correcting surface code, specifically the distance-three surface code comprising 17 qubits, on the Zuchongzhi 2.1 superconducting quantum processor. By executing multiple consecutive error correction cycles, we significantly reduce the logical error after applying corrections, achieving the first demonstration of repeated error correction using a surface code. This experiment represents a fully functional instance of an error-correcting surface code, marking a significant step towards scalable fault-tolerant quantum computing.