Lorentz Violation at One Loop

The proof of one-loop renormalizability of the general Lorentz- and CPT-violating extension of quantum electrodynamics is described. Application of the renormalization-group method is discussed and implications for theory and experiment are considered.Comment: 10 pages, 28 figures, latex, uses sprocl.sty (included), talk presented at the Second Meeting on CPT and Lorentz Symmetry, Bloomington, IN, August 200

Topological cluster state quantum computing

The quantum computing scheme described in Phys. Rev. Lett. 98, 190504 (2007), when viewed as a cluster state computation, features a 3-D cluster state, novel adjustable strength error correction capable of correcting general errors through the correction of Z errors only, a threshold error rate approaching 1% and low overhead arbitrarily long-range logical gates. In this work, we review the scheme in detail framing discussion solely in terms of the required 3-D cluster state and its stabilizers.Comment: 11 pages, 20 figures, v2 substantially revised and simplified to remove the need for prior exposure to cluster state quantum computin