134th RQC Seminar

• 講演者

  Dr. Zhengyang Zhou
  ( Zhejiang Sci-Tech University, China )

• 日程

  2024年8月5日（月） 16:00-17:00

• 開催場所

  ハイブリッド（ZOOM・ Wako Main Research 3F 345-347 Seminar Room/ 研究本館3階 セミナー室(345-347) C01）

• 講演タイトル

  Frustration elimination and excited state searching in coherent Ising machines

• お問合せ

  rqc_info[at]ml.riken.jp

講演概要
Coherent Ising machines (CIM) have been proposed as a promising analog computational approach to efficiently find different degenerate ground states of large and complex Ising models. However, CIMs face challenges in solving frustrated Ising models, in which the energetic preferences between all spin pairs cannot be satisfied simultaneously. As CIMs map the energy to the loss, the intrinsic loss in frustrated Ising models prohibits to leverage quantum effects in such machines. To circumvent these detrimental effects of frustration, we propose a method to modify the energy-to-loss mapping in CIMs, so that frustrated ground states can be expressed with lossless states CIMs. In our proposal, degenerate optical parametric oscillator (DOPO) modes encode the ground state candidates of the studied Ising model, while the ancillary modes enable the autonomous transformation to a frustration-free Ising model that preserves the ground states encoded in the DOPO modes. Such frustration elimination may empower current CIMs to benefit from quantum effects in dealing with frustrated Ising models. In addition, our method can also map the energies of excited states to a vanishing loss, so that searching for states with arbitrary energy will be possible.