Seminar: Shailesh Chandrasekharan (Duke University)

Title: Qubit Regularization: Large Charge CFTs and Asymptotic Freedom

Abstract: Qubit regularization is the idea to regulate a QFT on a lattice with a finite dimensional Hilbert space per site. This idea is important for studying QFTs on a quantum computer. It is well know that such an approach is viable for a variety of CFTs that arise at quantum critical points of lattice Hamiltonians. The qubit approach also provides a numerical advantage for studying CFTs in large charge sectors on classical computers.

We use this idea to extend our previous work and compute conformal dimensions at the O(4) Wilson-Fisher fixed point in the sub-leading large charge sectors. In contrast to CFTs, the study massive QFTs that arise at asymptotically free fixed points create interesting challenges for qubit regularization. Here we show how asymptotically free O(3) model can also be formulated with two qubits per lattice site.

Download the slides here: https://pandora.infn.it/public/slides-chandrasekharan