Two-step dynamics of photoinduced phonon entanglement generation between remote electron-phonon systems

TL;DR

This paper investigates the two-step process of generating phonon entanglement between remote electron-phonon systems after photoexcitation, revealing how optical pulse design influences entanglement dynamics and how these can be observed experimentally.

Contribution

It introduces a numerical study of phonon entanglement dynamics, highlighting the two-step process and the importance of pulse shaping for controlling entanglement.

Findings

Electron entanglement is generated immediately upon photoexcitation.

Phonon entanglement follows electron entanglement via electron-phonon interactions.

Phonon entanglement dynamics can be observed through time-resolved spectroscopy.

Abstract

The generation of quantum entanglement between phonons in photoirradiated remote electron-phonon systems is numerically studied. Upon excitation by a visible/ultraviolet laser pulse, the entanglement of electrons is immediately generated and that of phonons follows via electron-phonon interactions, i.e., the entanglement generation of phonons is a two-step process. Therefore, it is important to design the temporal properties of incident optical pulses in order to control the entanglement of electrons and/or phonons. These features are revealed by the quantum mutual information and the composite modes derived from the Heisenberg equation of motion. The calculated results also show that the dynamics of the phonon entanglement can be observed by time-resolved spectroscopy on the scattered light.