Papers/Preprints

Abstract: We investigate a class of quantum error-correcting codes to correct errors on both qubits and higher-state quantum systems represented as qudits. These codes arise from an original graph-theoretic representation of sets of quantum errors. In this framework, we represent the algebraic conditions for error correction in terms of edge avoidance between graphs providing a visual representation of the interplay between errors and error-correcting codes. Most importantly, this framework supports the development of quantum codes that correct against a predetermined set of errors, in contrast to current methods. A heuristic algorithm is presented, providing steps to develop codes that correct against an arbitrary noisy channel. We benchmark the correction capability of reflexive stabilizer codes for the case of single-qubit errors by comparison to existing stabilizer codes that are widely used. In addition, we present two instances of optimal encodings: an optimal encoding for fully correlated noise, which achieves a higher encoding rate than previously known, and a minimal encoding for single-qudit errors on a four-state system.

Abstract: We develop a generalization of the $Q$-construction of the first author, Diemer, and the third author for Grassmann flops over an arbitrary field of characteristic zero. This generalization provides a canonical idempotent kernel on the derived category of the associated global quotient stack. This idempotent kernel, after restriction, induces a derived equivalence over any twisted form of a Grassmann flop. Furthermore its image, after restriction to the geometric invariant theory semistable locus, ``opens'' a canonical ``window'' in the derived category of the quotient stack. We check this window coincides with the set of representations used by Kapranov to form a full exceptional collection on Grassmannians. Even in the well-studied special case of standard Atiyah flops, the arguments yield a new proof of the derived equivalence.

Abstract: In this article we will build a universal imbedding of a regular Hom- Lie triple system into a Lie algebra and show that the category of regular Hom-Lie triple systems is equivalent to a full subcategory of pairs of $\mathbb{Z}_2$- graded Lie algebras and Lie algebra automorphism, then finally give some characterizations of this subcategory.

Abstract: We Show that every finite $\mathbb{Z}$-grading on the algebra of compact operators is induced by a decomposition of the underlying Complex Hilbert space. We do this by first showing that every $\mathbb{Z}$-grading of the compoact operators defines a Peirce decomposition of a certain ideal. Then show this decomposition induces the $\mathbb{Z}$-grading on the compact operators. While finally as a Corollary we will show that every finite $\mathbb{Z}$-grading on the bounded operators is also induced by a decomposition of the underlying Hilbert Space