Entanglement witnesses of four-qubit tripartite separable quantum states*
| Autor: | Miao Xu, Wei-Feng Zhou, Feng Chen, Li-Zhen Jiang, Xiao-Yu Chen |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Communications in Theoretical Physics. 74:035102 |
| ISSN: | 1572-9494 0253-6102 |
| DOI: | 10.1088/1572-9494/ac3fb1 |
| Popis: | A quantum entangled state is easily disturbed by noise and degenerates into a separable state. Compared to the entanglement with bipartite quantum systems, less progress has been made for the entanglement with multipartite quantum systems. For tripartite separability of a four-qubit system, we propose two entanglement witnesses, each of which corresponds to a necessary condition of tripartite separability. For the four-qubit GHZ state mixed with a W state and white noise, we prove that the necessary conditions of tripartite separability are also sufficient at W states side. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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