Quench-Probe Setup as Analyzer of Fractionalized Entanglement Spreading

Abstract

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 by energy selectivity. 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.

Accepted version

References in corpus (10)

• Many-Body Physics with Ultracold Gases
• Topological Quantum Matter with Ultracold Gases in Optical Lattices
• The Luttinger model following a sudden interaction switch-on
• Topological classification of dynamical phase transitions
• Topology induced anomalous defect production by crossing a quantum critical point
• Dynamics in the Ising field theory after a quantum quench
• Entanglement evolution and generalised hydrodynamics: interacting integrable systems
• Robustness of the Kondo effect in a quantum dot coupled to Majorana zero modes
• Quantum Quench in the Infinitely Repulsive Hubbard Model: the Stationary State
• Quench-induced entanglement and relaxation dynamics in Luttinger liquids

Cited by in corpus (2)

• Local Information Flow in Quantum Quench Dynamics
• Entanglement dynamics in minimal Kitaev chains