Quantum Plasmonics with multi-emitters: Application to adiabatic control

TL;DR

This paper develops a mode-selective model for N quantum emitters interacting with localized surface plasmon polaritons on a spherical nanoparticle, enabling quantum control applications like population transfer via adiabatic techniques.

Contribution

It introduces a general framework for modeling multi-emitter interactions with plasmonic modes, facilitating quantum information processing with nanosystems.

Findings

Efficient population transfer possible when emitters are on the same side of the nanoparticle.

Transfer is blocked when emitters are on opposite sides due to destructive superposition.

Adiabatic control enables decoherence-free quantum state manipulation.

Abstract

We construct mode-selective effective models describing the interaction of N quantum emitters (QEs) with the localised surface plasmon polaritons (LSPs) supported by a spherical metal nanoparticle (MNP) in an arbitrary geometric arrangement of the QEs. We develop a general formulation in which the field response in the presence of the nanosystem can be decomposed into orthogonal modes with the spherical symmetry as an example. We apply the model in the context of quantum information, investigating on the possibility of using the LSPs as mediators of an efficient control of population transfer between two QEs. We show that a Stimulated Raman Adiabatic Passage configuration allows such a transfer via a decoherence-free dark state when the QEs are located on the same side of the MNP and very closed to it, whereas the transfer is blocked when the emitters are positioned at the opposite sides of the MNP. We explain this blockade by the destructive superposition of all the interacting plasmonic modes.