Next week Monday we will be joining the Q+ Hangout at the IQC video conference room QNC:B201

Monday May 27 10am, QNC:B201

Speaker:David Poulin (Université de Sherbrooke)

 Title: Tradeoffs Between Thermal and Quantum Fluctuations in 2D Quantum Memories

Abstract:

Under a certain set of conditions collectively known as "local topological order", the low energy spectrum of a system is robust to local perturbations. This has the consequence that quantum information encoded in the degenerate ground state of such a system is stable at zero temperature. On the other hand, the existence of a macroscopic energy barrier between ground states imply that information encoded in the low energy manifold is robust against thermal fluctuations. Here, we demonstrate that for local commuting projector codes, local topological order prohibits the existence of an energy barrier, which shows a tradeoff between robustness to quantum and thermal fluctuations.

Cheers

  Aharon