Past Quantum Field Theory Seminar

15 January 2013
12:00
Mir Faizal
Abstract
We will first review the construction of N =1 supersymmetric Yang-Mills theory in three dimensions. Then we will construct a superloop space formulation for this super-Yang-Mills theory in three dimensions.Thus, we will obtain expressions for loop connection and loop curvature in this superloop space. We will also show that curvature will vanish, unless there is a monopole in the spacetime. We will also construct a quantity which will give the monopole charge in this formalism. Finally, we will show how these results hold even in case of deformed superspace.
  • Quantum Field Theory Seminar
30 October 2012
12:00
Alastair Kay
Abstract

Topological quantum error correcting codes, such as the Toric code, are
ideal candidates for protecting a logical quantum bit against local noise.
How are we to get the best performance from these codes when an unknown
local perturbation is applied? This talk will discuss how knowledge, or lack
thereof, about the error affects the error correcting threshold, and how
thresholds can be improved by introducing randomness to the system. These
studies are directed at trying to understand how quantum information can be
encoded and passively protected in order to maximise the span of time between successive rounds of error correction, and what properties are
required of a topological system to induce a survival time that grows
sufficiently rapidly with system size. The talk is based on the following
papers: arXiv:1208.4924 and Phys. Rev. Lett. 107, 270502 (2011).

  • Quantum Field Theory Seminar
15 May 2012
12:00
Elizabeth Gasparim (UNICAMP-Brazil)
Abstract
This is a report of joint work with T. Koppe, P. Majumdar, and K.  Ray. I will define new partition functions for theories with targets on toric singularities via products of old partition functions on  crepant resolutions. I will present explicit examples  and show that the  new partition functions turn out to be homogeneous on MacMahon factors.
  • Quantum Field Theory Seminar

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