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W state generation and effect of cavity photons on the purification of dot-like single quantum well excitons | | C.-M. Li
; Y.-N. Chen
; C.-W. Luo
; D.-S. Chuu
; J.-Y. Hsieh
; | | Date: |
10 Oct 2004 | | Subject: | quant-ph | | 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. | | Source: | arXiv, quant-ph/0410074 | | Services: | Forum | Review | PDF | Favorites | |
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