Continuous-variable entanglement distillation between remote quantum nodes
| Autor: | Jieli Yan, Lixia Ma, Xiaojun Jia, Yanhong Liu, Zhihui Yan |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Quantum network Quantum decoherence Quantum Physics 02 engineering and technology Quantum entanglement 021001 nanoscience & nanotechnology Topology 01 natural sciences Multipartite entanglement law.invention Homodyne detection law 0103 physical sciences 010306 general physics 0210 nano-technology Distillation Quantum Entanglement distillation |
| Zdroj: | Physical Review A. 98 |
| ISSN: | 2469-9934 2469-9926 |
| Popis: | The development of quantum network relies on high-quality entanglement between remote quantum nodes. In reality the unavoidable decoherence limits the quality of entangled quantum nodes, however, entanglement distillation can overcome this problem. Here we propose an experimentally feasible scheme of continuous-variable entanglement generation, storage, and distillation between distant quantum nodes, which only requires the atomic ensemble quantum memory and balanced homodyne detection (BHD). Initially one copy of a bipartite entangled state of light, suffering phase fluctuations during the distributions, is stored in two distant atomic ensembles so that the atomic ensembles are entangled. Within the storage lifetime, by distributing and storing another copy of entangled optical modes in these two atomic ensembles, the distillation on entangled atomic spin waves can be implemented based on the post-selection of the BHD result. Our scheme provides a highly entangled state between remote quantum nodes for downstream applications, and enables the extension to multipartite entanglement distillation in a large-scale quantum network. |
| Databáze: | OpenAIRE |
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