W state generation and effect of cavity photons on the purification of dot-like single quantum well excitons

C. M. Li*, Y. N. Chen, Chih-Wei Luo, J. Y. Hsieh, D. S. Chuu

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

A scheme of three-particle entanglement purification is presented in this work. The physical system undertaken for investigation is dot-like single quantum well excitons independently coupled through a single microcavity mode. The theoretical framework for the proposed scheme is based on the quantum jump approach for analyzing the progress of the trible-exciton entanglement as a series of conditional measurement has been taken on the cavity field state. We first investigate how cavity photon affects the purity of the double-exciton state and the purification efficiency in two-particle protocol. Then we extend the two-particle case and conclude that the three-exciton state can be purified into W state, which involves the one-photon-trapping phenomenon, with a high yield. Finally, an achievable setup for purification using only modest and presently feasible technologies is also proposed.

Original languageEnglish
Pages (from-to)111-122
Number of pages12
JournalInternational Journal of Quantum Information
Volume3
Issue numberSUPPL. 1
DOIs
StatePublished - 1 Nov 2005

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