Quantum entanglement in dense multiqubit systems

TL;DR

This paper investigates how laser tuning and dipole interactions influence quantum entanglement in dense multiqubit systems, revealing optimal conditions and phase transition effects that enhance entanglement.

Contribution

It introduces a method to optimize entanglement in dense multiqubit systems by tuning laser frequency and analyzing phase transition phenomena.

Findings

Maximum entanglement occurs near phase transition points.

Laser tuning can optimize entanglement despite dissipation.

Dipole interactions significantly affect entanglement dynamics.

Abstract

The pairwise entanglement of an arbitrary atomic pair randomly extracted from a laser-driven dense multiqubit sample in the presence of quantum dissipation due to spontaneous emission is considered. The dipole-dipole interaction between the particles shifts the laser-qubit resonance frequency and consequently modifies the quantum entanglement. By means of an appropriate tuning of the laser frequency, one can optimize the entanglement in this system. For large ensembles, the maximum entanglement occurs near the laser parameters where the steady-state sample exhibits phase transition phenomena.