RQC Seminar

123rd RQC Seminar

• Speaker

  Dr. Lev Ioffe
  ( Google Quantum AI )

• Date

  16:00-17:00, June 12, 2024 (Wednesday)

• Venue

  Hybrid(ZOOM・ Room S507 at Wako S51 Chem. ＆ Mat.Phys. Bldg.）

• Title

  NISQ effort: present and future.

• Inquiries

  rqc_info[at]ml.riken.jp

Abstract
Presently quantum computers contain ~100 qubits whose lifetime is roughly four order of magnitude longer than the time of gate operation. In the near future we expect both the number of qubits and life time to increase by the factors of 2-5 but hardly more. Can we learn something valuable from such machines? I will argue that these, very imperfect and noisy computers can address a number of fundamental physics problems that are difficult (if not impossible) to simulate on a classical computer.
I will begin by a quick review of the superconducting quantum chips and their limitations. I will then discuss what physical systems are 'natural' for the simulation on these devices: spin liquids, spin diffusion, bose liquids (with and without magnetic fields) and what are the outstanding fundamental problems that one might address. In the second part of the talk I will describe the recent discovery that Google team made while simulating one of these problems: formation of the bound states in pseudo one dimensional chains and their completly unexpected stability in non-intergable systems. Finally I discuss in more detail the easiest of the unsolved problems from the list above: decay of high energy states. I will show that computations in different limits give contradictory results while numerical results do not agree with any expectations making this problem very attractive for simulation by quantum hardware.