Time: 4pm ~ 5:15pm (JST); 9am ~ 10:15am (CET); 3pm ~ 4:15pm (Taiwan)

In this talk, I will briefly introduce the application of machine learning methods on quantum many-body problems. It includes a self-supervised learning approach to decide the topological phase transition in the systems of ultracold atoms by using Time-of-Flight images only without knowing any priori knowledge [1]. We then develop the Random Sampling Neural Networks for the investigation of quantum many body ground state properties in the strong interacting regime by a model rtained in the weak interacting regime [2]. Finally, we provide an Quantum-Inspired-Recurrent Neural Network, which could give a precise long-time dynamics of a quantum many-body system, even the model is trained in the short-time regime. We hope to show the great possibility to use machine learning as a new tool to investigate the quantum many-body problems.

*Detailed information about the seminar refer to the email.

The main aim of this workshop is that the quantum people in RIKEN (iTHEMS and RQC) and Vancouver (Quantum BC) get together online to discuss scientific activities and explore future collaborations.

Program:
August 24, 2021 (8:30am - 1:00pm) Tokyo
August 23, 2021 (4:30pm - 9:00pm) Vancouver

Tetsuo Hatsuda (iTHEMS): Welcome + iTHEMS overview
Yasunobu Nakamura (RQC): RQC overview
Lukas Chrostowski (UBC): Quantum BC overview
Shunji Matsuura (1QBit): Accurate state preparation on noisy quantum devices
Olivia Di Matteo (UBC): Operational, gauge-free quantum tomography
Yasunobu Nakamura (RQC): Towards superconducting quantum computing
Jason Chang (iTHEMS): Improving Schroedinger equation implementations with gray code for adiabatic quantum computers
Robert Raussendorf (UBC): Computationally universal phase of quantum matter
Akira Furusawa (RQC): Large-scale quantum computing with quantum teleportation

August 25, 2021 (8:30am - 1:30pm) Tokyo
August 24, 2021 (4:30pm - 9:30am) Vancouver

Etsuko Itou (iTHEMS): Digital quantum simulation for screening and confinement in gauge theory with a topological term
Joe Salfi (UBC): Engineering long coherence times of spin-orbit qubits in silicon
Seiji Yunoki (RQC): Quantum simulations for quantum many-body systems: Variational quantum algorithms and beyond
Takumi Doi (iTHEMS): Hybrid quantum annealing via molecular dynamics
Drew Potter (UBC): Simulating highly-entangled matter with quantum tensor networks
Seigo Tarucha (RQC): High-fidelity quantum gates in silicon quantum computing

Organizing Institutes:
iTHEMS: RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program
RQC: RIKEN Center for Quantum Computing
Quantum BC

Organizers:
Tetsuo Hatsuda (iTHEMS)
Yasunobu Nakamura (RQC)
Shunji Matsuura (1QBit)
Joseph Salfi (UBC)
Erika Kawakami (RQC / RIKEN CPR)
Neill Lambert (RIKEN CPR)

Among the most ubiquitous phases of matter, gases and crystalline solids are definitely the simplest to be described. Their physics is indeed almost entirely textbooks material and it can be summarized within the elegant frameworks of kinetic theory and Debye theory. Liquids and specially viscoelastic systems and amorphous materials (e.g. glasses) exhibit a much richer and complex dynamics with provides a large set of fundamental and unresolved physical questions. Given the tremendous microscopic complexity of these systems, which is manifest in a large landscape of scales and anomalous behaviours, the effective field theory (EFT) paradigm of isolating only a few, but fundamental, information could provide a winning approach. This talk is based on the simple, but indeed extremely difficult, question of whether these phases of matter can be distinguished, classified and understood using emergent and/or fundamental symmetry principles as in their ordered crystal counterpart. More precisely, we will combine EFTs, hydrodynamics and holographic methods to tackle the above question. I will present the most recent developments in this direction and I will discuss with you the most important open questions and avenues to explore in the near future.

The Cosmic Microwave Background (CMB) gives a photographic image of the Universe when it was still an “infant”. We have been using it to test our ideas about the origin of the Universe. The CMB research told us a remarkable story: the structure we see in our Universe such as galaxies, stars, planets, and eventually ourselves originated from tiny quantum fluctuations in the period of the early Universe called cosmic inflation. While we have accumulated strong evidence for this picture, the extraordinary claim requires extraordinary evidence. The last prediction of inflation that is yet to be confirmed is the existence of primordial gravitational waves whose wavelength can be as big as billions of light years. To this end we have proposed to JAXA a new satellite mission called LiteBIRD, whose primary scientific goal is to find signatures of gravitational waves in the polarisation of the CMB. In this presentation we describe physics of gravitational waves from inflation, and the LiteBIRD proposal.