Robust-to-loss entanglement generation using a quantum plasmonic nanoparticle array

TL;DR

This paper presents a robust method for generating entanglement between quantum dots using a plasmonic nanoparticle array, effective even with significant losses and imperfections, advancing quantum state control at the nanoscale.

Contribution

The authors introduce a loss-tolerant entanglement scheme using dipole interference and postselection in a plasmonic nanoparticle array, differing from prior dissipative approaches.

Findings

Entanglement is robust to plasmonic losses and imperfections.

The scheme enables long-distance quantum entanglement in nanoscale systems.

It offers a practical alternative for quantum state engineering at the nanoscale.

Abstract

We introduce a scheme for generating entanglement between two quantum dots using a plasmonic waveguide made from an array of metal nanoparticles. We show that the scheme is robust to loss, enabling it to work over long distance plasmonic nanoparticle arrays, as well as in the presence of other imperfections such as the detuning of the energy levels of the quantum dots. The scheme represents an alternative strategy to the previously introduced dissipative driven schemes for generating entanglement in plasmonic systems. Here, the entanglement is generated by using dipole-induced interference effects and detection-based postselection. Thus, contrary to the widely held view that loss is major problem for quantum plasmonic systems, we provide a robust-to-loss entanglement generation scheme that could be used as a versatile building block for quantum state engineering and control at the nanoscale.