Photonic spatial Bell-state analysis for robust quantum secure direct communication using quantum dot-cavity systems
| Autor: | Ren, Bao-Cang, Wei, Hai-Rui, Hua, Ming, Li, Tao, Deng, Fu-Guo |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Eur. Phys. J. D 67, 30 (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1140/epjd/e2012-30626-x |
| Popis: | Recently, experiments showed that the spatial-mode states of entangled photons are more robust than their polarization-mode states in quantum communications. Here we construct a complete and deterministic protocol for analyzing the spatial Bell states using the interaction between a photon and an electron spin in a charged quantum dot inside a one-side micropillar microcavity. A quantum nondemolition detector (QND) for checking the parity of a two-photon system can be constructed with the giant optical Faraday rotation in this solid state system. With this parity-check QND, we present a complete and deterministic proposal for the analysis of the four spatial-mode Bell states. Moreover, we present a robust two-step quantum secure direct communication protocol based on the spatial-mode Bell states and the photonic spatial Bell-state analysis. Our analysis shows that our BSA proposal works in both the strong and the weak coupling regimes if the side leakage and cavity loss rate is small. Comment: 8 pages, 4 figures |
| Databáze: | arXiv |
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