Plasmon-assisted quantum control of distant emitters

TL;DR

This paper demonstrates how plasmonic waveguides can be used to generate, control, and sustain quantum correlations between distant emitters, enabling long-distance quantum information processing.

Contribution

It introduces a method to actively control quantum correlations between distant emitters via plasmon-assisted interactions and external laser fields.

Findings

External laser enhances steady-state correlations.

Persistent correlations can be decoupled and evolve independently.

Long-distance control (~1 μm) works for resonant and detuned emitters.

Abstract

We show how to generate and control the correlations in a set of two distant quantum emitters coupled to a one-dimensional dissipative plasmonic waveguide. An external laser field enhances the dimer's steady-state correlations and allows an active control (switching on/off) of nonclassical correlations. The plasmon-assisted dipolar-interacting qubits exhibit persistent correlations, which in turn can be decoupled and made to evolve independently from each other. The setup enables long-distance ($\sim 1\, \mu$m) qubit control that works for both resonant and detuned emitters. For suitable emitter initialization, we also show that the quantum correlation is always greater than the classical one.