Witness based nonlinear detection of quantum entanglement

• URL: http://arxiv.org/abs/2502.02868v1
• Date: Wed, 05 Feb 2025 03:55:06 GMT
• Title: Witness based nonlinear detection of quantum entanglement
• Authors: Yiding Wang, Tinggui Zhang, Xiaofen Huang, Shao-Ming Fei,
• Abstract summary: We show that when the nonlinear entanglement detection strategy fails to detect the entanglement of an entangled state with two copies, it may succeed with three or more copies. Our strategy can also be applied to detect multipartite entanglement by using the witnesses for bipartite systems, as well as to entanglement concentrations.
• Score: 0.3499870393443269
• License:
• Abstract: We present a nonlinear entanglement detection strategy which detects entanglement that the linear detection strategy fails. We show that when the nonlinear entanglement detection strategy fails to detect the entanglement of an entangled state with two copies, it may succeed with three or more copies. Based on our strategy, a witness combined with a suitable quanutm mechanical observable may detect the entanglement that can not be detected by the witness alone. Moreover, our strategy can also be applied to detect multipartite entanglement by using the witnesses for bipartite systems, as well as to entanglement concentrations.

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