Postselection as a Resource for Quantum Control: Dynamics, Geometry, and Topology in Open Systems

Datum

23.02.2026

Zeit

16:30 - 17:30

Sprecher

Prof Kater Murch

Zugehörigkeit

UC Berkeley

Serie

MPI-PKS Kolloquium

Sprache

en

Hauptthema

Physik

Andere Themen

Physik

Beschreibung

Postselection—the conditioning of quantum dynamics on specific measurement outcomes—is a powerful but subtle control resource in open quantum systems. By selecting particular measurement trajectories, postselection fundamentally reshapes quantum evolution, leading to dynamics that cannot be described by standard unitary or Lindbladian frameworks alone. In this colloquium, I will introduce how postselection gives rise to effective non-Hermitian dynamics, alters measurement backaction, and enables access to new geometric and topological phenomena. Using superconducting quantum circuits with engineered dissipation as a concrete experimental platform, I will illustrate how postselecting on “no-jump” trajectories generates non-Hermitian Hamiltonians with exceptional points, complex energy landscapes, and unconventional adiabatic behavior. I will show how these features manifest in phenomena such as weak-values, complex Berry phases, topological state transfer, and nonlinear quantum evolution. Beyond specific experiments, postselection provides a bridge between measurement theory, non-Hermitian physics, and quantum control. From this perspective, postselection emerges as a versatile control resource that bridges measurement theory, non-Hermitian physics, and dissipative quantum control, touching on Liouvillian dynamics, quantum trajectories, and stabilization of open-system evolution.

Letztmalig verändert: 04.02.2026, 07:37:11