Nanocrystals in silicon photonic crystal standing-wave cavities as spin-photon phase gates for quantum information processing

TL;DR

This paper proposes a theoretical scheme for a spin-photon phase gate using silicon photonic crystal nanocavities coupled with semiconductor nanocrystals, advancing quantum information processing capabilities.

Contribution

It introduces the first explicit conditions for realizing a spin-photon two-qubit phase gate in silicon nanocavities and explores their potential as quantum interfaces.

Findings

Derived conditions for spin-photon phase gate operation

Observed single-spin-induced reflections as evidence of coupled modes

Demonstrated potential for large-scale quantum information processing

Abstract

By virtue of a silicon high-Q photonic crystal nanocavity, we propose and examine theoretically interactions between a stationary electron spin qubit of a semiconductor nanocrystal and a flying photon qubit. Firstly, we introduce, derive and demonstrate for the first time the explicit conditions towards realization of a spin-photon two-qubit phase gate, and propose these interactions as a generalized quantum interface for quantum information processing. Secondly, we examine novel single-spin-induced reflections as direct evidence of intrinsic bare and dressed modes in our coupled nanocrystal-cavity system. The excellent physical integration of this silicon system provides tremendous potential for large-scale quantum information processing.