** JOINT INSTITUTE FOR NUCLEAR RESEARCH**

** Bogoliubov Laboratory of Theoretical Physics**

** LABORATORY SEMINAR**

** November 2 (Thursday) at 15:00**

** in the BLTP Conference hall**

** Yury G. Makhlin**

(Laboratory of Condensed Matter Physics, HSE;

Landau Institute of Theoretical Physics)

**Quantum computations in superconductive and hybrid topological systems**

Abstract:

We discuss the general requirements for a physical system to implement

all stages of quantum computing. Devices based on Josephson junctions

are discussed as examples of the implementation of qubits and quantum

operations. The idea of topological quantum computing and its

implementation using Majorana zero modes are presented. In particular,

we consider Majorana states in topological Josephson junctions on the

surface of a topological insulator as well as the possibilities of

conducting quantum operations and quantum measurements in such systems.

Join Zoom meeting:

https://us02web.zoom.us/j/81979160128?pwd=V0pPaGJFdndYR2FBL2o2MEU1WEdhZz09

Conference ID: 819 7916 0128

Password: 598714

***Tuesday, 26 September 2023, 11.00***

**MLIT Conference Hall**

Online seminar via Webinar

***Solemn seminar dedicated to the 70th anniversary of the birth of V.V. **

**Korenkov***

*Program of the seminar*

*–** Scientific session*

G.V. Trubnikov, Congratulatory speech

T.A. Strizh, From mainframe to computing for megascience

V.A. Ilyin, Grid technologies in Russia

S. Campana, On JINR’s participation in the WLCG project

A.B. Degtyarev, Collaboration with SPbU

E.N. Cheremisina, Collaboration with Dubna University

*–** Official****session**. **Speeches by colleagues and friends*

*–**Buffet reception*

——————————————————————————-

Добрый день! Сегодня, во вторник, 26 сентября, в 11-00 в Конференц-зале ЛИТ

состоится Торжественный семинар, посвященный 70-летию со дня рождения

В.В. Коренькова .

Подключение к Webinar:

https://jinr.webinar.ru/28441625/1771045619

____________________________________________________________

Tuesday, 26 September 2023, 11.00

MLIT Conference Hall

Online seminar via Webinar

Solemn seminar dedicated to the 70th anniversary of the birth of V.V. Korenkov

Program of the seminar

– Scientific session

G.V. Trubnikov, Congratulatory speech

T.A. Strizh, From mainframe to computing for megascience

V.A. Ilyin, Grid technologies in Russia

S. Campana, On JINR’s participation in the WLCG project

A.B. Degtyarev, Collaboration with SPbU

E.N. Cheremisina, Collaboration with Dubna University

– Official session. Speeches by colleagues and friends

– Buffet reception

**25 july 2023 г., в 15.00 в room. 310 willl be held seminar:**

**E.G. Nikonov, R.G. Nazmitdinov, P.I. Glukhovtsev**

Manifestation of the hexatic phase in confined two-dimensional systems

with circular symmetry

Quasi-two-dimensional systems play an important role in the manufacture

of various devices for the needs of nanoelectronics. Obviously, the

functional efficiency of such systems depends on their structural

properties, which could change during phase transitions under the

influence of external conditions (for example, temperature). Until now,

the main attention has been focused on the search for signals of phase

transitions in continuous two-dimensional systems. One of the central

issues in such systems is the analysis of the conditions for the

nucleation of the hexatic phase, which is accompanied by the appearance

of defects in the Wigner crystalline phase at a certain temperature.

However, for modern nanosystems, there arises both a practical and

fundamental question about the critical number of electrons at which the

symmetry of the crystal lattice begins to break in the system under

consideration and, consequently, the nucleation of defects starts. The

dependences of the orientational order parameter and the correlation

function, which characterize topological phase transitions, are studied

as functions of the number of particles at zero temperature. The result

of calculations allows us to establish the precursors of the phase

transition “hexagonal lattice – hexatic phase” for N=92,136,187,

considered as an example.

**28 april 2023, 15.00, ROOM. 310**

**Danshin A.A. (NRC «Kurchatov Institute»)**

**Development of numerical methods for solving problems of quantum**

** mechanics based on the synthesis of stochastic and deterministic**

** approaches**

(based on the PhD thesis)

The main problem of the existing methods of quantum mechanical

calculations of the properties of atoms, molecules, and crystals is the

high computational complexity in cases where it is necessary to more

fully take into account electronic correlations, which limits the

possible range of calculated properties of such systems. Therefore, it

is relevant to create new physical and mathematical models and program

code based on them. The work presents an original quantum Monte Carlo

method for solving the Schrödinger equation for fermion systems,

verified on atoms containing _s_-electrons. An asymptotically accurate

(in terms of a step of computational grid) algorithm for solving the

Hartree-Fock and Kohn-Sham equations without the use of basis sets was

created, implemented and verified on the full set of elements of the

periodic table, the computational complexity of which is comparable to

existing algorithms based on basis sets. A mathematical model has been

developed and implemented for taking into account electronic

correlations in the Hartree-Fock method, where the correlations are

obtained from a stochastic calculation.

Links: https://jinr.webinar.ru/284416

*Artamonov Aleksey*

NRNU MEPhI

https://jinr.webinar.ru/28441625/1213632137

*Multi-agent technologies for collecting, processing and visualizing

unstructured data*

Within the seminar, the developments of the MEPhI Department of

Competitive Systems Analysis on the implementation of multi-agent

systems for collecting, analyzing and presenting scientific and

technical information from various types of information resources

(international abstract databases, scientific and information social

networks) will be presented. The developed methods make it possible to

create intelligent information systems that can automatically monitor a

given information field; form thematic collections of documents for

different levels of users – organization, laboratory, person; act as

management decision support systems. The prototype of the information

system for the analysis of scientific publications of the Joint

Institute for Nuclear Research will be presented at the seminar.

Indico:/https://indico-hlit.jinr.ru/event/373/

**February 14 of 2023 year at 10:30.**

Dear colleagues.

High Energy Physics Division seminar

will take place on Tuesday February 14

of 2023 year at 10:30.

https://zoom.us/j/96427006231?pwd=eDZtQmF5NmtmVnNtWXNUQXhOQkU0dz09

Meeting ID: 964 2700 6231

Passcode: 618007

Speaker:** V.V.Korenkov (M.G. Mescheryakov LIT JINR, Dubna)**

Subject: **Distributed and hybrid computing for Large-scale scientific**

**projects**

A B S T R A C T

The evolution of the global computer infrastructure for experiments at

the LHC at CERN (WLCG) is presented.

Large-scale scientific projects are being implemented in Russia (PIC,

NICA, SKIF, BAYKAL,SILA…),

the most important part of which is the creation of computer systems for

processing experimental data.

It is necessary to create a scientific collaboration in Russia, bringing

together key scientific centers

and universities participating in large-scale scientific projects.

Kind regards, S.I. Manaenkov.

Seminar_hepd@pnpi.nrcki.ru