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Quantum Information and Computation

Optical detection of quantum entanglement between two quantum dots near a metal nanoparticle

HeYong, ZhuKa-Di

Published Mar 1, 2013• 1 citation
Publisher

Abstract

We theoretically study the interaction between two semiconductor quantum dots (SQDs) and a metal nanoparticle (MNP) within the quantum description. The plasmon field produced in the MNP excited by ...
DOI
10.5555/2481602.2481612

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We theoretically study the interaction between two semiconductor quantum dots (SQDs) and a metal nanoparticle\ (MNP) within the quantum description. The plasmon field produced in the MNP excited by the external field can play the platform of F\"{o}rster energy transfer between two SQDs which gives rise to the generation of entangled states. The Fano effect can be shown in the energy absorption spectrum of MNP, which originates from constructive or destructive interference between two competing optical pathways. Since the generated entangled state is in one pathway, the steady-state concurrence of entanglement can be evaluated by the observation of Fano profile. Because the concurrence of two SQDs is determined by both the pump intensity and the energy difference, one can properly choose these two parameters for detecting the non-negligible entanglement. When the pump intensity is very strong, there is no entanglement. The method to observe entanglement with the Fano profile, so, has a limited range of applicability. The optical observation is a novel approach to reveal entanglement. It may be used to optically detect quantum entanglement in many solid-state systems.
We study optical effects in a hybrid system composed of a semiconductor quantum dot (SQD) and a spherical metal nanoparticle (MNP) that interacts with a weak probe and a strong pump electromagnetic field. We use modified nonlinear density matrix equations for the description of the optical properties of the system and calculate, numerically, the first-order susceptibilities of the SQD, the MNP, and the total hybrid nanostructure of the probe field in the presence of the pump field. We investigate the dependence of the probe absorption and dispersion spectra of the SQD, the MNP, and the total nanostructure on the interparticle distance and the detuning of the pump field, and stress the influence of the MNP contribution to the total optical response. The results we find are explained according to the theory of two distinct metastates, which constitute conjugations of the SQD excitonic and the MNP plasmonic excitations. We also show that the optical response strongly depends on the actual values of the SQD material parameters.