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Witnessing entanglement without entanglement witness operators
2016-11-10  【 】【打印】【关闭

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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