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Physical Review A

Exciton entanglement in coupled quantum dots in a microcavity

Chun-Hua Yuan, Ka‐Di Zhu, Xiao-Zhong Yuan

Published Jun 8, 2007• 16 citations
Publisher

Abstract

We propose a scheme that allows generation of the Bell and $W$-type entangled states of excitons in quantum dots confined in a single-mode microcavity. It is shown that the entanglement of excitons can be generated when the photons leaking out of the cavity are detected by photon counter. The effect of environmental temperature on the entanglement of excitonic states is also studied.

DOI
10.1103/physreva.75.062309

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We propose a scheme that allows generation of the Bell and WWW-type entangled states of excitons in quantum dots confined in a single-mode microcavity. It is shown that the entanglement of excitons can be generated when the photons leaking out of the cavity are detected by photon counter. The effect of environmental temperature on the entanglement of excitonic states is also studied.
We discuss the generation of two types of entangled state of two photons-- noon state which is entangled in number and polarization, and polarization entangled state which is entangled in polarization and frequency. We consider a single quantum dot coupled with a bimodal cavity in strong coupling regime. We analyze the effect of exciton-phonon coupling on the concurrence of the generated entangled states. We find that for both states concurrence is maximum in the absence of the anisotropic energy gap between exciton states and remains unchanged in the presence of exciton-phonon coupling. However, for finite anisotropic energy gap concurrence decreases on the increasing temperature of phonon bath.
We discuss generation of two types of entangled states of two photons: noon state, which is entangled in number and polarization, and polarization-entangled state, which is entangled in polarization and frequency. We consider a single quantum dot coupled with a bimodal cavity in a strong coupling regime. We analyze the effect of exciton–phonon coupling on concurrence of the generated entangled states. We find that for both states, concurrence is maximum in the absence of an anisotropic energy gap between exciton states and remains unchanged in the presence of exciton–phonon coupling. However, for finite anisotropic, energy gap concurrence decreases with increasing temperature of the phonon bath.
Using a polaron master equation approach, we investigate the cooperative two-photon resonance behavior between two modes of a field inside a semiconductor microcavity containing two quantum dots. The cooperative two-mode two-photon resonance occurs when two off-resonant quantum dots, initially prepared in exciton states, emit one photon in each cavity mode and deexcite simultaneously. Using this two-photon two-mode interaction, we demonstrate how to generate an entangled state of two qutrits (tripartite unit of quantum information). The bases for the qutrits are formed by the states of the cavity modes containing zero, one, and two photons. We also study the effect of exciton-phonon coupling on the entanglement and the probability of generating two-qutrit states, and explore the role of the phonon bath temperature.