ELFT HÍRADÓ

[Janos Asboth <asboth.janos AT wigner.mta.hu>]

*Seminar of the Dept of Quantum Optics and Quantum Information, Inst for
Solid State Physics and Optics, Wigner RCP*
Self-correction in topological quantum memories

*Anna Kómár*
Institute for Quantum Information and Matter, California Institute of
Technology
 (host: János Asbóth)

Thursday, 7 June 2018 14:00, KFKI Campus, Bldg. 1, 2nd floor, Conference
Room

One of the challenges of building a quantum computer is the question of
information storage. This is typically done by utilizing redundancy,
similar to how classical hard drives store information in many-body
magnetic systems, quantum memories would store quantum information in
several qubits instead of a single one. However, while classical magnetic
systems tend to be self-correcting, i.e., their state does not need to be
continuously monitored to preserve the information stored there, most
quantum memories don't have such a self-correcting property.

In this work I will review quantum many-body systems that are candidates
for self-correction. I will present a result of my PhD work, with which it
is possible to determine the self-correcting properties of a large group of
many-body systems (qudit codes).

References:
A. Kómár, O. Landon-Cardinal, K. Temme. "Necessity of an energy barrier for
self-correction of Abelian quantum doubles" Phys.Rev.A (2016)
K. Temme. "Thermalization time bounds for Pauli stabilizer Hamiltonians"
Communications in Mathematical Physics (2017)



Everyone is welcome to attend.