Seminar

Title: The 1,2,3-Conjecture and a related problem for bipartite graphs

Abstract:

Title: Quantum Walks and State Transfer

Abstract:

Quantum walks are the quantum analogues of classical random walks and can be used to model quantum computations. If a quantum walker starts at a vertex of a graph and after some length of time, has probability 1 of being found at a different vertex, we say there is perfect state transfer between the two vertices.

Title: The quantum and private capacities of quantum channels, and the solution in the low-noise regime

Abstract:

We first summarize background on the quantum capacity of a quantum channel, and explain why we know very little about this fundamental quantity, even for the qubit depolarizing channel (the quantum analogue of the binary symmetric channel) despite 20 years of effort by the community.

Title: Symmetric group characters as symmetric functions

Abstract:

The irreducible polynomial representations have Schur polynomials as characters. Similarly there is an in-homogeneous basis of symmetric functions that we call the "irreducible character basis" which are characters of irreducible symmetric group modules when the symmetric group is represented as the subgroup of permutation matrices.

Title: Using eigenvalues to bound the independence number of a graph

Abstract:

Finding a maximum independent set (or clique) in an arbitrary graph has been shown to be NP-hard.  As any independent set gives a lower bound on the independence number, determining an upper bound is usually more useful. 

Title: Periodic Vertices in Graphs

Abstract:

If $X$ is a graph with adjacency matrix $A$, then any question about the continuous quantum walk on $X$ is a question about the entries of the unitary matrices \[U(t) = \exp(itA)\]

Two pertinent questions are:

Title: Geometric drawings of graphs (Part I)

Abstract:

This is the first of two talks about drawings of graphs that arise from geometry.

Part I: Understanding rectilinear drawings.

Title: Cospectral graphs, cospectral complements

Abstract: