Algorithmic simulation of far-from-equilibrium dynamics using superconducting quantum computer

Walter Pogosov,

Head of the Laboratory of Physics of Micro- and Nanostructures

Dukhov Research Institute of Automatics (Rosatom State Corporation)

06 June 2018, 15:00-16:30

Skoltech, TPOC-4, Nobel str. 1, Red Building, 3rd floor, Room 351

We point out that superconducting quantum computers are prospective for the simulation of the dynamics of spin models far from equilibrium, including nonadiabatic phenomena and quenches. The important advantage of these machines is that they are programmable, so that different spin models can be simulated in the same chip, as well as various initial states can be encoded into it in a controllable way. This opens an opportunity to use superconducting quantum computers in studies of fundamental problems of statistical physics such as the absence or presence of thermalization in the free evolution of a closed quantum system depending on the choice of the initial state as well as on the integrability of the model. We here perform proof-of-principle digital simulations of two spin models, which are the central spin model and the transverse-field Ising model, using 5- and 16-qubit superconducting quantum computers of the IBM Quantum Experience. We found that these devices are able to reproduce some important consequences of the symmetry of the initial state for the system’s subsequent dynamics, such as the excitation blockade. However, lengths of algorithms are currently limited due to quantum gate errors. We also discuss some heuristic methods which can be used to extract valuable information from imperfect experimental data.

Short BIO. Walter Pogosov is currently head of the Laboratory of Physics of Micro- and Nanostructures at Dukhov Research Institute of Automatics (Rosatom State Corporation). He graduated from the Faculty of General and Applied Physics of Moscow Institute of Physics and Technology in 1999 and obtained PhD in theoretical physics from the same Institute in 2002. In his thesis he focused on vortex matter in mesoscopic and unconventional superconductors. After completing his PhD, W. Pogosov conducted a postdoctoral research at the University of Leuven (Belgium) and Okayama University (Japan), where he worked on superconductor/ferromagnet heterostructures and on trapped ultracold gases. He came back to Russia in 2006 and got a position at the Institute for Theoretical and Applied Electrodynamics RAS, but continued a tight collaboration with French and Belgium researchers. During that time, he conducted a research on exactly solvable models in connection to Cooper pairing at nanoscale, on fluctuations in superconducting microstructures, as well as on quantum statistics of excitons.

In 2014 W. Pogosov obtained a habilitation degree from Lebedev Physical Institute RAS and moved to Dukhov Research Institute of Automatics. He currently focuses on superconducting quantum circuits for quantum computation and simulation, quantum optics with superconducting qubits, as well as on topological insulator/superconductor heterostructures.

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