Multi-qubit quantum phase gates based on surface plasmons of a nanosphere

TL;DR

This paper proposes a scheme for multiqubit quantum phase gates utilizing surface plasmons of a nanosphere, analyzing their behavior and potential for quantum information processing.

Contribution

The paper introduces a novel deterministic multiqubit quantum phase gate scheme based on surface plasmon interactions with quantum emitters.

Findings

Design and analysis of two-, three-, and four-qubit quantum phase gates

Discussion of metal loss effects on gate performance

Potential applications in quantum information processing

Abstract

The Dicke subradiance and superradiance resulting from the interaction between surface plasmons of a nanosphere and an ensemble of quantum emitters have been investigated using a Green function approach. Based on such an investigation, we propose a scheme for a deterministic multiqubit quantum phase gate. As an example, twoqubit, threequbit, and fourqubit quantum phase gates have been designed and analyzed in detail. Phenomena due to the losses in the metal are discussed. Potential applications of these phenomena to quantuminformation processing are anticipated.