[Landau ITP Seminars] Fwd: [ITP Staff] Thursday 21.05.2026 - ITP/CAS Colloquium

[Stanislav Apostolov]

Zoom: 842 4794 6637
Passcode: 411486

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  		ТЕМА:
  		[ITP Staff] Thursday 21.05.2026 - ITP/CAS Colloquium

  		ДАТА:
  		2026-05-19 10:02

  		ОТ:
  		info+seminars at itp.ac.ru

  		КОМУ:
  		staff at itp.ac.ru, students at itp.ac.ru, seminars at itp.ac.ru

Уважаемые коллеги!

На онлайн коллоквиум по теоретической физике в четверг 21.05 будут 
заслушаны 2 доклада:

1) 10:00:00 по московскому времени: Pan Zhang (Institute of Theoretical 
Physics, Chinese Academy of Sciences)
Decoding of Quantum Error-Correcting Codes: From Exact Spin Glass 
Solution to Neural Network Decoder, Then to Quantum-Circuit Decoder

The talk first shows how optimal maximum-likelihood decoding for certain 
quantum error-correcting codes (e.g., surface code with independent 
qubit noise, repetition code under circuit-level noise) maps to exact 
computation of the partition function of planar spin glasses, yielding a 
polynomial-time exact decoder. Next, a more general decoding framework 
based on generative neural networks is presented, followed by a faster 
variational quantum-circuit counterpart that can run on quantum hardware 
without syndrome measurements.

Biography:

Pan Zhang is Professor and Director of the Second Research Division at 
ITP-CAS. Research: statistical physics, quantum physics, machine 
learning. Proposed sparse-state tensor network method (resolved Google 
Sycamore sampling problem); introduced Variational Autoregressive 
Networks (VAN) and Matrix Product State (MPS) Born machine. Honors: 
Young Scientist Award of CAS (2023), Second Prize of Beijing Natural 
Science Award (2022). Since 2023, Divisional Associate Editor (DAE) for 
Physical Review Letters (physics and machine learning section).

2) 10:00:00 по московскому времени: Yuriy Makhlin (L. D. Landau 
Institute for Theoretical Physics, Russian Academy of Sciences)
Topological Josephson Junctions and Quantum Computations

Josephson vortices in planar superconducting junctions on top of a 
topological insulator material may bind electronic states. These subgap 
states include Majorana modes at zero energy. Their position can be 
controlled via magnetic field and phase bias, enabling coherent 
manipulation of quantum states and quantum information processing. 
Recent experimental data on supercurrent in planar topological Josephson 
junctions show features possibly linked to low-energy subgap modes. The 
talk discusses how these modes may explain observed behavior and how 
interference of local Josephson currents can be used to demonstrate 
Majorana zero modes and probe their quantum state. Analysis includes 
disorder effects and other methods to probe bound states, including 
spectroscopy.

Biography:

Yuriy Makhlin earned his PhD (1995) and Doctor of Sciences (2004) from 
the Landau Institute. Research interests: quantum computation, 
superconducting qubits, quantum circuits, topological materials. Postdoc 
at UIUC and Karlsruhe; led a research group at University of Karlsruhe 
(2001-2004) as Sofya Kovalevskaya awardee. Corresponding member of 
Russian Academy of Sciences; received Fock prize (2018).

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