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| Witnessing entanglement without entanglement witness operators |
| 2016-11-10
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| Institute of Theoretical Physics | | Chinese Academy of Sciences | | Key Laboratory of Theoretical Physics | | Seminar | | Title 题目 | Witnessing entanglement without entanglement witness operators | | Speaker 报告人 | 李卫东 教授 | | Affiliation 所在单位 | 山西大学 | | Date 日期 | 2016年11月10日（星期四） 15:00 | | Venue 地点 | Room 6620,ITP new Building/理论物理所新楼6620报告厅 | | Abstract 摘要 | Quantum mechanics predicts the existence of correlations between composite systems that, although puzzling to our physical intuition, enable technologies not accessible in a classical world. Notwithstanding, there is still no efficient general method to theoretically quantify and experimentally detect entanglement of many qubits. Here we propose to detect entanglement by measuring the statistical response of a quantum system to an arbitrary nonlocal parametric evolution. We witness entanglement without relying on the tomographic reconstruction of the quantum state, or the realization of witness operators. The protocol requires two collective settings for any number of parties and is robust against noise and decoherence occurring after the Implementation of the parametric transformation. To illustrate its user friendliness we demonstrate multipartite entanglement in different experiments with ions and photons by analyzing published data on fidelity visibilities and variances of collective observables.
| | Contact Person 联系人 | 易俗 |
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