SKM 2023 – wissenschaftliches Programm
DY 44.11: Poster
Donnerstag, 30. März 2023, 13:00–16:00, P1
Quench-Probe Setup as an Analyzer of Fractionalized Entanglement Spreading — •Nicolas P. Bauer1, Jan Carl Budich2, Björn Trauzettel1, and Alessio Calzona3 — 1Julius Maximilians Universität Würzburg, Würzburg, Germany — 2TU Dresden, Dresden, Germany — 3IQM Quantum Computers, München, Germany
We propose a novel spatially inhomogeneous setup for revealing quench-induced fractionalized excitations in entanglement dynamics. In this quench-probe setting, the region undergoing a quantum quench is tunnel-coupled to a static region, the probe. Subsequently, the time-dependent entanglement signatures of a tunable subset of excitations propagating to the probe are monitored. We exemplify the power of this generic approach by identifying a unique dynamical signature associated with the presence of an isolated Majorana zero mode in the post-quench Hamiltonian. In this case excitations emitted from the topological part of the system give rise to a fractionalized jump of log(2)/2 in the entanglement entropy of the probe. This dynamical effect is highly sensitive to the localized nature of the Majorana zero mode, but does not require the preparation of a topological initial state.