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iTHEMS Weekly News Letter

Hot Topic

Seminar by RIKEN researcher, Dr. Nathan Shammah


RIKEN researcher Nathan Shammah gave the first seminar for the QuCoIn (Quantum Computing and Information Science) working group. On June 13, he hosted an interactive workshop on open-source software and the Quantum Toolbox in Python (QuTiP) library. Open-source software, which allows anyone to see its source code, is becoming popular in business, in science, and among the general public: even tech giants like Microsoft and Google are investing in open-source projects. Python, in particular, is a highly-developed ecosystem with many packages, and one that most of you are probably already familiar with. The QuTiP code is one such package, which lets you simulate quantum systems, and even quantum circuits, on your (non-quantum) computer. About twenty people attended Nathan’s workshop and started learning to use QuTiP. We hope that this experience, and the new tool kit, will help people to accelerate their research and advance the field. If you have questions about QuTiP, please ask Nathan—he is very happy to discuss the software! And if you are interested in quantum tech research highlights, you can subscribe to Nathan's monthly newsletter on quantum technologies from the link below.

Upcoming Events


AIMR Main Building venue photo

g-RIPS Sendai 2019

June 17 - August 9, 2019

GRIPS (Graduate-level Research in Industrial Projects for Students)-Sendai program was held last summer (June 18 - Aug. 10, 2018) with the support of iTHEMS as well as other institutions and companies. Two industrial projects were launched under the suggestion of TOYOTA and NEC, and two teams composed of US and Japanese students have worked intensively to find solutions of these problems. See for the details of the GRIPS program and the summary of activities at GRIPS-Sendai 2018.

This year, GRIPS-Sendai program will be held from June 17 through Aug. 9, 2019 with a larger scale under the support of iTHEMS. Stay tuned for further information.

Venue: 4F Research Space, AIMR Main Building, Advanced Institute for Materials Research (AIMR), Tohoku University

Event Official Language: English


ABBL-iTHEMS Joint Seminar

Using combined Particles-in-MHD-Cells to model particle acceleration in astrophysical shocks

June 17 at 14:00 - 15:00, 2019

Dr. Allard Jan van Marle (Research Professor, Ulsan National Institute of Science and Technology, Republic of Korea)

Venue: #132, 1F, Main Research Building, RIKEN

Event Official Language: English


iTHEMS Colloquium

Spacetime Geometry of Black Holes, Wormholes, and Time Machines

July 2 at 15:30 - 17:00, 2019

Prof. Pei-Ming Ho (Department of Physics, National Taiwan University)

Venue: Large Meeting Room, 2F Welfare and Conference Building (Cafeteria), RIKEN

Broadcast: R511, Computational Science Research Building, R-CCS, Kobe Campus, RIKEN / SUURI-COOL (Kyoto), #204-205, 2F Maskawa Building for Education and Research, North Campus, Kyoto University / SUURI-COOL (Sendai), #303, 3F AIMR Main Building, Advanced Institute for Materials Research (AIMR), Tohoku University

Event Official Language: English


1-day Workshop on Quantum Gravity

July 4 at 9:30 - 18:00, 2019

In order to construct a quantum theory of gravity, it is currently required to study freely from various viewpoints. In this small workshop, we will discuss various different topics such as field theory, string theory, quantum black hole, quantum universe and so on, and will consider future directions to quantum gravity casually but deeply. Let's enjoy exciting discussions!

Venue: #132, 1F, Main Research Building, RIKEN

Event Official Language: English


SOKENDAI-iTHEMS Joint Workshop "Genetics meets Mathematics"

July 7 - 8, 2019

Dr. Jeffrey Fawcett (Senior Research Scientist, iTHEMS)

Venue: LecTore Hayama

Event Official Language: Japanese


Workshop on Sine-square deformation and related topics 2019 thumbnail

Workshop on Sine-square deformation and related topics 2019

July 11 at 10:00 - 18:00, 2019

Sine-Square Deformation (SSD) is a newly found boundary condition that involves the spatial modulation of the coupling constant of quantum systems.
Since its discovery, it has received broad attention in the context of various research field. This workshop aims at offering the opportunities for the researchers interested in SSD to convene and exchange ideas on the subject.

Venue: #435-437, Main Research Building, RIKEN

Event Official Language: Japanese


Co-hosted by iTHEMSSUURI-COOL (Kyoto)

RIMS-iTHEMS joint WS on "Math of Jets"

July 29 - 31, 2019

Co-hosted by RIMS Kyoto University and iTHEMS RIKEN.

Venue: Kyoto University, Main Campus Research Bldg No 15, #201

Event Official Language: Japanese

Paper of the Week

Dr. Tomoki Ozawa thumbnail

Probing localization and quantum geometry by spectroscopy


Localization has been one of the main topics of interest in condensed matter physics for more than half a century. Study of localizatoin has recently been entering into a new stage because of the developments in the concept of many-body localization, and also of the recent advances in the technology of quantum-engineered systems such as ultracold atoms and trapped ions. In this paper, we propose a novel method to quantitatively study localization of a quantum state in the platform of quantum-engineered systems. Our proposal makes use of the fluctuation-dissipation theorem; we consider periodically modulating the quantum system and observing the exciation rate. We find that the localization of a quantum state is related to the integral of the excitation rate over the modulation frequency. Our proposal to probe localization does not require high resolutino microscopes to spatially resolve the quantum state. We apply our method to various examples which are of direct experimental relevance in ultracold atoms. Moreover, inspired by a relation between quantum fluctuations and the quantum metric, we describe how our scheme can be generalized to extract the full quantum-geometric tensor of many-body systems. The figure (left) shows how the wavefunction of two interacting particles in a harmonic trap spreads as one increases the interaction, and the figure (right) shows how such spreading can be probed through excitation rate measurements for various values of the interaction strengths.

Tomoki Ozawa, Nathan Goldman
"Probing localization and quantum geometry by spectroscopy"
Phys. Rev. Research 1, 032019(R) (2019)
doi: 10.1103/PhysRevResearch.1.032019
arXiv: 1904.11764

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